Sara
Bathrooms are by their very nature, warm and damp places so it is important that when you decorate that you use suitable materials that are designed for bathrooms. Bathroom tiles look fantastic when they are newly installed however, over time the grouting can begin to look a bit grubby or mouldy and it really spoils the look. Do not despair, the grouting can be cleaned and this will restore it to its former glory.   https://youtu.be/-no1rqjp0oA   If your tiles are cleaned regularly they will remain looking smart for a good long time but even the most diligent cleaner will notice the odd speckle or stain that does not come out with regular cleaning.