Today I have been doing the fun job of cleaning the shower grout. However at the end of cleaning rather then the grout looking lovely and white I can see that at the edge of some tiles is a black line and at this point the grout seems to be not as thick as other areas so how do I know of these tiles need regrouting?
I don't want to unnecessarily get this done but have worried used by looking at some past posts and it says that if grout has failed then water can cause problems with mould and damp in walls etc. my ensuite shower is directly behind my fitted wardrobe so I don't want damp setting in.
Does anyone know how to check or should I get I'm a tiler?