Leave the solution to work its magic (check the container for information on how long your product is safe to stay applied for).

Transparency is important to us, which is why we're always clear about where we find our recommendations. Once that’s done, all it should need is a good scrub with a stiff brush and a final rinse with water.Some grout cleaners are great at removing the mildew that a damp environment causes, while others are best at tackling ingrained stains or actively coating faded grout in a fresh layer of coloured solution.

If your grout is discolouring in a wet or humid environment, it’s likely to be mould and mildew that are causing the issue. Just run it along the offending grout lines – ensuring the area is clean of grease and grime first – then leave it to dry before wiping off any excess from the tiles. Mould Shield® actively prevents the growth of bacteria, mildew and black mould that are commonly found in areas of high humidity.To use, simply spray your tile and grout (from a distance of 5 to 10cm away), making sure to coat thoroughly, then leave to settle for about 20 minutes before rinsing down with water and a sponge. This cleaner contains bleach – although you’ll likely find its stain-removing abilities are stronger than the straight-up stuff – so be careful not to get it on clothes or other surfaces.

Good for walls as well as floors, this grout cleaner won’t require much in the way of elbow grease, so there’s no need to wield the old toothbrush you’ve been saving for tackling those stains. If you like to keep on top of your grout-cleaning regime, then Pro-Kleen’s Tile Grout Cleaner is a good addition to your arsenal. Spray and walk away – it’ll set about fighting that discolouration while you get on with something else for five minutes.This super-tough cleaner is robust enough to use on outdoor surfaces like patios and paving as well as on tiles and grout, and can take as little as five minutes to work. Most products also work to whiten the grout, scrubbing off stains and replacing them with a clean, water-resistant finish that will keep your tiling looking as fresh as the day it was first finished. The solution comes with a sponge applicator, which you can either use attached to the tube or separately (it’s prone to falling off when on the tube, but you can always glue it back on if that’s your preferred method).