cross-pollination

This is a Female Auto Flower that had a female in the tent cross sex. That was removed, destroyed, tent sprayed and 5 other healthy plants removed, sprayed. 30 hrs have passed and no sign of cross contamination on any of the other plants.

Hey fellow growers, I know that it is near impossible to have a completely airtight grow room. But i Live in an area where the pollen from the ditch weed is everywhere...i mean everywhere. Can anybody offer suggestions as to how to make my grow room sealed enough to keep this pollen from...