Lovely looking harvests Shed. and congrats!!
prevent kill PM, why not use it in the wash? It seems to work just fine.
I've used it the last couple of times in place of the H2O2. Fortunately I'm PM free this round. I used half a cup in 18L, which I think is close to your 1% solution. I just found it was cheaper, and if it was used toI think it did a much better job on the PM than hydrogen peroxide does though.