After every grow you must make sure to clean your growroom properly. I personally use a mild bleach solution to clean my garden down with [1 part bleach and 3 parts water]. Also make sure to let everything dry and use a fan to dry with. I always clean my grow op down at least twice to ensure total sanatation. Bleach will sanatize the pollen rendering it non-viable. Make sure to clean down EVERYTHING bro. Hope this was of help to you.