Hi
@Inigo_Montoya! Well, pollen is like dust, it's able to fly everywhere, hide in discreet places, and move in the air. In your scenario, I would triple-clean the grow room, using a vacuum-cleaner then white vinegar then soap mixed with neem oil. The vacuum-cleaner will help to get rid of the pollen left in the room, the vinegar will sterilize your environment and kill every living bacterias, and the soap+neem oil solution will help to prevent bugs from invading your garden for a while. Hope this will help, keep us up-to-date and happy growing 👊