Grouting around tiles can become discoloured and dirty over time, acting as a haven for mould or mildew in damp bathrooms with insufficient heating. It can also crack and crumble over time, meaning that the seal between the tiles is no longer waterproof. For both of these problems it is worth getting a bathroom professional in to deal with the repairs, as cleaning grout or re-grouting is not a simple task.
The best way to clean the grout is with a steam cleaner, which any bathroom tradesman should have. This can restore both the cleanliness and the colour of your grout. If patching or re-grouting repairs are needed then your bathroom expert will first clean the tiles and grout (usually with a bleach solution) to ensure any dirt or crumbling grout is removed. They will then dry the areas that need re-grouting, mix the grout and apply it to the tiled area to make the tiles waterproof once again. The cost of the job will depend on just how much of the bathroom needs re-grouting, as well as the size of the room. If much of the grout looks bad then your tradesman may decide to remove most of it before re-grouting, rather than simply patching obviously damaged areas.
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