How to Clean a Bathtub — Material-Safe Methods | Simply Maid

You promised yourself you'd get to it this weekend. But Saturday came and went, and the bathtub still has that dull, grimy ring you've been pretending not to notice. Sound familiar? You're not alone — and it takes less time to fix than you think.

**Quick Answer:** To clean a bathtub, wet the surface with warm water, apply baking soda, scrub with a soft nylon brush dipped in soapy water, then rinse and dry. To sanitise, spray with a solution of two parts rubbing alcohol to one part water, leave for five minutes, then rinse. Always check your tub material first — acrylic, porcelain, and fibreglass each need different care.

Why Your Bathtub Needs More Than a Rinse

A quick rinse after bath time might feel like enough, but it's not. Body oils, soap residue, and dead skin cells cling to the surface and create a film that breeds bacteria over time. Research from [SafeHome.org](https://www.safehome.org/resources/germs-in-your-bathroom/) found that bathroom surfaces — including tubs and shower floors — can harbour roughly 70 times more bacteria than a toilet seat.

That doesn't mean your bathtub is dangerous. But it does mean a weekly clean and regular sanitising will keep it fresh, hygienic, and far more pleasant to soak in.

Check Your Tub Material First

Before you grab the nearest spray bottle, take a moment to identify what your bathtub is made of. Using the wrong product can cause permanent damage.

**Acrylic** — The most common in Australian homes. Lightweight, warm to the touch. [Kohler's care guide](https://www.kohler.com/en/support/how-to-use-kohler-cleaning-products/how-to-clean-an-acrylic-bathtub-or-whirlpool) warns against abrasive cleaners, scouring pads, and bleach — all of which can scratch or discolour the surface. Stick to mild dish soap and a soft sponge.
**Porcelain (enamel over steel or cast iron)** — More durable and resistant to scratching. Can handle slightly stronger cleaners, including diluted bleach. Avoid steel wool, which can chip the enamel.
**Fibreglass** — Lightweight and affordable, but porous. Scratches easily and stains fast. Use only non-abrasive cleaners and soft cloths.

**Tip:** Not sure what yours is? Tap it gently with a knuckle. Acrylic sounds hollow and feels warm. Porcelain sounds solid and feels cold.

How to Clean a Bathtub (Weekly Method)

This general clean works for all tub types and takes about 15 minutes.

**Wet the surface** with warm water using a hand shower or a bucket of warm water from the tap.
**Sprinkle baking soda** generously over the damp surface. It works as a gentle abrasive without scratching.
**Prepare a soapy solution** — a few squirts of liquid dish detergent in a bucket of warm water.
**Scrub with a soft nylon brush** dipped in the soapy water. Work in sections, re-wetting the surface as needed.
**Rinse at intervals** so you can spot any areas you've missed.
**Replace the soapy water** if it gets murky, and give the tub a final once-over.
**Don't forget the outside** — scrub the exterior and wipe down taps and [chrome fixtures](/cleaning-101/bathroom/keep-your-chrome-bathroom-fittings-clean-and-rust-free) with the same solution.
**Rinse everything thoroughly** to remove all soap and cleaner residue.
**Dry with a lint-free towel** — inside and out. This prevents water spots and slows mineral buildup.

How to Remove Mould from Your Bathtub

Humidity, poor ventilation, and warm surfaces make bathtubs a favourite spot for mould. According to [NSW Health](https://www.health.nsw.gov.au/environment/factsheets/Pages/mould.aspx), mould exposure can cause a runny nose, eye irritation, coughing, and wheezing — and it may trigger asthma attacks in sensitive people.

The good news: most bathroom mould is surface-level and straightforward to remove. For deeper mould problems beyond the tub, our [comprehensive guide to mould removal](/cleaning-101/bathroom/a-comprehensive-guide-to-mould-removal) covers every surface in the bathroom.

**Gear up first.** Wear rubber gloves, a face mask, and protective eyewear. Open the window and door for ventilation.
**Mix your solution.** Combine 3–4 tablespoons of household bleach in 1 litre of warm water. Pour into a spray bottle. *(For acrylic tubs, use white vinegar instead of bleach — see material guide above.)*
**Spray the mouldy areas** generously and leave for 15–20 minutes.
**Wipe with a non-abrasive pad**, rinsing it regularly until the mould is gone.
**Follow up with a general clean** using the weekly method above (skip steps 1–2 since the tub is already wet and treated).

**⚠️ Safety note:** Never mix bleach with vinegar — the combination produces toxic chlorine gas that causes coughing, breathing problems, and eye irritation. — [Washington State Department of Health](https://doh.wa.gov/community-and-environment/contaminants/bleach-mixing-dangers)

How to Remove Stubborn Stains and Grime

You might have tried scrubbing with every product on the shelf and the stains still won't budge. If that sounds familiar, here's a method that does the heavy lifting for you.

**Make a paste** of baking soda and hydrogen peroxide (3% solution, available at Coles or Woolworths).
**Dampen the stained area** with water, then apply the paste in a thick layer. Leave it to dry completely — this can take 30–60 minutes.
**Scrub gently** with a damp, non-abrasive sponge.
**Rinse and inspect.** Repeat once or twice if traces remain.

The Bicarb and Vinegar Myth

A common tip online is to mix baking soda and vinegar together for extra cleaning power. But as [Dr Nathan Kilah, chemist at the University of Tasmania](https://theconversation.com/vinegar-and-baking-soda-a-cleaning-hack-or-just-a-bunch-of-fizz-225177), explains: the fizzy reaction is "essentially a visual placebo." The acid and base neutralise each other, leaving you with salty water. **Use them separately** — bicarb for scrubbing power, vinegar for dissolving mineral deposits — and you'll get far better results.

How to Remove Hard Water Stains

If you live in an area with [hard water](/cleaning-101/bathroom/is-hard-water-affecting-your-home-health) — common in parts of Adelaide, Perth, and regional Australia — you'll notice chalky white or yellowish buildup around the waterline and near the taps. That's calcium and magnesium left behind as the water evaporates.

**Mix equal parts** warm water and white vinegar in a spray bottle.
**Spray the stained areas** and let it sit for 10–15 minutes.
**Wipe with a damp microfibre cloth** in firm, quick strokes.
**Dry immediately** with a clean towel to prevent new deposits forming.

**Prevention tip:** Wipe your tub dry after every use. It takes 30 seconds and stops hard water stains from building up in the first place.

For heavy buildup, a product like **CLR** (available at Bunnings and most supermarkets) is effective, but always check it's safe for your tub material first. If [soap scum](/cleaning-101/bathroom/methods-to-remove-soap-scum-from-different-bathroom-surfaces) is also a problem, tackle that separately with a dedicated soap scum remover.

How to Sanitise Your Bathtub

Cleaning removes visible dirt. Sanitising kills the bacteria you can't see. According to the [CDC](https://www.cdc.gov/hygiene/about/cleaning-and-disinfecting-with-bleach.html), cleaning should always come first — disinfectants need a clean surface to work properly.

For a simple, effective sanitiser:

**Mix two parts rubbing alcohol (70%)** with one part water in a spray bottle.
**Spray the entire interior** of the clean bathtub.
**Leave for 5–10 minutes**, then rinse thoroughly and wipe dry.

**How often?** If the bathtub is used daily, sanitise once a week. If it's used less frequently, sanitise it before each use — standing water and dust can settle on unused tubs.

**⚠️ Safety note:** Keep rubbing alcohol and all cleaning products well out of reach of children. Ensure the bathroom is ventilated when using any chemical cleaners.

Frequently Asked Questions

Q: How do I get my bathtub white again?

Start with a paste of baking soda and hydrogen peroxide — apply it to the stained areas, let it dry completely, then scrub gently with a non-abrasive sponge. For hard water stains, use a white vinegar and water spray instead. Repeat as needed. Avoid bleach on acrylic tubs, as it can yellow the surface over time.

Q: Can I use bleach on an acrylic bathtub?

No. Bleach can discolour and damage acrylic surfaces. Use mild dish soap for general cleaning, and white vinegar (diluted 50/50 with water) for mineral deposits and mould. Always use a soft cloth or sponge — never a scouring pad.

Q: How often should I deep clean my bathtub?

A light clean once a week is enough for most households. Do a deeper clean — including mould checks, grout scrubbing, and sanitising — once a month. If your tub is used daily by multiple people, increase to fortnightly deep cleans.

Q: How do I disinfect a bathtub without bleach?

Mix two parts rubbing alcohol (70%) with one part water and spray the clean tub surface. Leave for 5–10 minutes, then rinse. White vinegar also has mild antibacterial properties and is safe for all tub types.

Q: Why do my bathtub stains keep coming back?

Hard water is usually the culprit. Calcium and magnesium in the water leave deposits every time the tub is used. The fix: wipe your tub dry after every use. For persistent hard water issues, consider a shower filter or water softener.

Sources & References

**NSW Health** — [Mould fact sheet](https://www.health.nsw.gov.au/environment/factsheets/Pages/mould.aspx). Referenced for mould health risks and recommended cleaning methods for household surfaces.
**CDC (Centers for Disease Control and Prevention)** — [Cleaning and Disinfecting with Bleach](https://www.cdc.gov/hygiene/about/cleaning-and-disinfecting-with-bleach.html). Referenced for proper disinfection procedures and the importance of cleaning before sanitising.
**Washington State Department of Health** — [Bleach Mixing Dangers](https://doh.wa.gov/community-and-environment/contaminants/bleach-mixing-dangers). Referenced for the dangers of mixing bleach with vinegar or ammonia-based products.
**Dr Nathan Kilah**, Senior Lecturer in Chemistry, University of Tasmania — [Why mixing bicarb and vinegar is just a bunch of fizz](https://theconversation.com/vinegar-and-baking-soda-a-cleaning-hack-or-just-a-bunch-of-fizz-225177). Cited for the science behind why bicarb and vinegar neutralise when mixed.
**Kohler** — [How to Clean an Acrylic Bathtub](https://www.kohler.com/en/support/how-to-use-kohler-cleaning-products/how-to-clean-an-acrylic-bathtub-or-whirlpool). Referenced for manufacturer guidance on safe cleaning methods for acrylic surfaces.
**SafeHome.org** — [Germs in Your Bathroom](https://www.safehome.org/resources/germs-in-your-bathroom/). Referenced for bacteria levels on bathroom surfaces compared to toilet seats.

*If you'd rather spend your Saturday at the park than scrubbing the bathtub, we're here for that.*

*Your trusted partner in a calmer, cleaner home.*

How to Clean and Sanitise a Bathtub — The Right Way for Every Surface