Does water really kill pollen?
Yes it does. I leave my pollinated plants overnight before spraying everything down. I'm usually only dusting a branch so the rest of the plant is covered in a plastic bag with just the buds I want to dust sticking out. Dust said buds, leave overnight in the shop then spray water all over everything including the floor around the pot(s). Then carry it away somewhere to remove the bag and spray the plant down even more - just in case - before it goes back in the flower room.
I did 5 different pollens on one plant that way. Just one each day and a new bag each time. If it's the only flowering plant you have going t the time then you don't have to be so careful but the bag should be used unless you are doing the whole plant for a seed run.
And don't drink an dust. I thought I was being so careful but ended up with all the plants in the room having reduced potency and yields with only 3 or 4 hundred seeds on each and they were fairly large plants that would have produced a few thousand seeds each in a mass pollination.
Now I have hemp farms popping up here so no more outdoor or flowering indoors during the spring and summer. My outdoor autos got badly knocked up last summer here. Was driving me nuts trying to figure out why they seemed to be doing not as well as the year prior.
Oh well. Hemp is good for our depressed local economy so a few must suffer for the greater good I guess. At least nobody's shooting at me or trying to bomb my house.
Always look on the bright side of life. ¯\_(ツ)_/¯