How to clean bathroom grout: the method we use

How to clean bathroom grout properly depends on what your grout is made of and how old it is. For routine grime use a bicarbonate of soda paste with a soft brush, for yellowed white grout switch to oxygen bleach in warm water, and for Victorian lime grout common in Glasgow tenements lean on enzyme cleaners and very little mechanical work. The wrong product on the wrong grout pulls colour out, weakens the bond and creates a much bigger job.

We clean bathrooms across Glasgow every day, from Shawlands tenements to Bearsden new-builds, and the single biggest mistake we see is one method applied to every grout type. Below is the order we follow, including the dwell times we use and the products our team carries in the van.

How to clean bathroom grout: what product works best?

For most modern cement grout, the best cleaner is a thick paste of bicarbonate of soda and warm water, left for ten minutes and worked in with a soft nylon brush. It lifts soap film, body oil and limescale without bleaching the colour or eroding the surface.

We rotate three products depending on the job. Bicarbonate paste handles routine domestic grime. Oxygen bleach, also sold as sodium percarbonate, brightens white grout that has gone grey. A neutral enzyme cleaner deals with organic stains in older lime grout where acid or chlorine would do more harm than good.

• Bicarbonate paste: 3 parts bicarb to 1 part warm water, 10 minute dwell, soft brush.
• Oxygen bleach solution: one tablespoon per pint of warm water, 15 minute dwell, never mixed with vinegar.
• Enzyme cleaner: spray, leave for 20 minutes, wipe with a damp microfibre, no scrubbing.

How do I get my bathroom shower grout white again?

To get white shower grout white again, mix oxygen bleach with hot water into a thick paste, apply with a small brush, leave for 15 to 20 minutes, then rinse. Two or three rounds across a fortnight will lift years of yellowing without damaging the tile or the silicone seals around the tray.

Chlorine bleach will whiten grout in one hit, but it dries it out, breaks the surface and pulls dye out of any coloured silicone nearby. Oxygen bleach is slower, gentler and works on the underlying biofilm rather than just bleaching the top. For Glasgow showers where limescale and soap film build up fast on hard-ish water, we follow the oxygen bleach round with a quick vinegar mist on the tile faces, never on the grout itself.

What cleans grout without scrubbing?

Enzyme cleaners and oxygen bleach soaks both clean grout with almost no scrubbing. You spray or paste the product on, walk away for 15 to 30 minutes, then rinse with warm water and a flat microfibre cloth.

These methods rely on chemistry rather than mechanical force, which is exactly what you want on older or softer grout that cannot take a stiff brush. If you have toddlers, asthma in the house, or pets that wander through the bathroom, enzyme cleaners are also the lowest-risk option. We reach for them whenever a client has flagged sensitivities, and on every job inside a listed building where strong acids and bleaches are off the table.

We sit this grout pass inside the wider weekly bathroom routine we explain in our regular cleaning rundown, so you can see where it fits in the rest of the job.

How do you clean light coloured grout in a bathroom that is 18 years old?

Older light coloured grout needs a slow, low-impact approach: oxygen bleach paste in short cycles, no acid, no stiff brushes. Eighteen year old grout has usually lost some of its surface, and any aggressive cleaner will keep pulling material out, which makes the discolouration worse over time.

We treat anything past the ten year mark as fragile until proven otherwise. The pattern is a 15 minute oxygen bleach dwell, a rinse, a proper look, then a second round only if the first one held. If the grout looks porous and patchy after one pass, the right call is usually a regrout, not more cleaning. A flat with sound 1990s grout looks fine after two careful sessions a fortnight apart. A flat with grout that has been chlorine bleached annually for a decade is often past saving.

How do you tell Victorian lime grout from modern cement grout?

Victorian lime grout is soft, slightly chalky, usually a warm off-white, and you can scratch it lightly with a fingernail, while modern cement grout is hard, set, and resists a nail. Epoxy grout, less common in domestic Glasgow bathrooms, feels almost plasticky and has a faint sheen.

We see all three across the city. A tenement bathroom in Garnethill or Hillhead that still has original tile work will often have lime grout, sometimes patched with cement in the high wear spots near the basin. A renovated Southside flat with new ceramic on the walls will almost always be cement, occasionally epoxy in the wet zone. Knowing which you have before you spray anything saves a regrout bill.

We wrote a separate piece on Glasgow tenement cleaning quirks that goes deeper on period bathroom fittings and what to leave alone.

How often should bathroom grout be cleaned?

A weekly wipe of the grout with a damp microfibre and a fortnightly deeper pass with bicarbonate paste is enough to keep most Glasgow bathrooms in good shape. A full oxygen bleach reset twice a year handles the build-up that wiping alone misses.

Hosts running Airbnb changeovers in the West End or Merchant City need to bump that frequency up sharply, because back-to-back guests use the shower more than a household would. In the summer season we schedule a 15 minute grout pass into every Friday changeover by default.

When should you stop cleaning and regrout instead?

Stop cleaning and regrout when grout is missing in chunks, when it stays dark after two oxygen bleach rounds, or when water is getting behind the tiles. At that point you are cleaning a sponge, and no product will fix structural failure.

Signs to watch for: powdery residue on the floor after a clean, hairline cracks running through the grout lines, soft spots you can press with a fingernail, and mould that reappears within days. If any two of those show up, book a tiler. The good news is partial regrouts are common and not expensive, and the bathroom looks transformed after a fresh line.

We have been cleaning Glasgow bathrooms since 2019, the same team throughout, fully insured, and we will tell you straight if your grout is past saving rather than pretending a third clean will rescue it.

If you would rather hand the whole job over, our one-off deep clean includes a full grout pass with the right product for your grout type, agreed before we start.

Ready to book? Get a quote in 60 seconds and we will quote the grout method along with the rest of the bathroom.