The answer to 'when to clean grout' is that grout should be cleaned regularly, typically every 6-12 months, to maintain its appearance and prevent staining or discoloration. Grout is a porous material that can easily trap dirt, grime, and spills, so a regular cleaning routine is important to keep it looking its best.
The frequency of grout cleaning will depend on factors such as how much foot traffic the area receives, whether the grout is sealed, and how often the floor is mopped or wiped down. High-traffic areas like kitchens and bathrooms may need more frequent cleaning, while low-traffic areas can usually be cleaned less often. It's a good idea to inspect your grout periodically and clean it as soon as you notice any discoloration or buildup.