Getting ready to harvest

I had afew Q: before i harvest i have a slight mite prob and very slight PM issue so im going to do the three step wash+ with first bucket w/lemon juice & baking soda, second bucket peroxide water & the third w/plain water my Question is how long after hacking them down do i have to wash them? Is their a time limit before the flowers would absorb the water and stuff. Thank you for your time
 
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