I do this wash @InTheShed here , I do just one top at a time . When I had bugs I was very happy to do it . I used a strainer to scoop up the bugs before I put another top in ! Hope this helps .I think the answer to this question will become clear after I've thrown the full plant into a bath full of water. There won't be any dirt on them, so it's just to rinse the beasties off.
Mold does worry me though. Making your buds wetter than they should be doesn't sound right.
But I'm going to give it a go.. for educational purposes