If you don’t stay on top of mold it can really get ahead of you! At first sighting of the green/black stuff make sure you take action with this great little tip. It works on both sprinklings of mold and for particularly bad areas of accumulated mold in your grout too – just take some cotton wool balls and soak them in a strong bleach or specialist mold remover.
Line them around the affected areas and let them sit overnight. In the morning take a good scrubbing brush with bristles and after removing the cotton balls, scrub with force and the mold should dissolve and lift off.