That's why learning how to waterproof it with silicone sealant is such a game-changer. To do this, you'll need a quality silicone sealant, ideally one labeled for bathroom use like the GE Supreme ...
Silicone sealant, the white waterproof lining found around showers ... Once suitably attired, fill an empty spray bottle with white vinegar and douse the mouldy area generously.