Is that 3% hydrogen peroxide you are using? I only have 2 weeks till harvest so I'm worried its a little to late.
Ya.. 3%... just do a bit of math for your 6 or 20 and reduce accordingly.. You know, once upon a long time ago, to demonstrate to a friend it was really impossible to use too much, I watered my clones with strait h202.. needless to say, the next morning the plant was a plant and was ready to do more plant things..
I have used h202 in LATE late budding to help break up and aerate soil that wont drain well anymore.. the plants love the (short burst) extra oxygen and responded accordingly.
So while I wouldn't ever suggest using 3.2 strait, I would take your 6% and use about a half cup.. your 20% and use about a 7th of a cup and so on and so on..
Lite does wont hurt your plants at this stage and it doesn't sound like you are worried about growing soil, o if it were me, and I can only speak for myself, but I HAVE done this many many times (h202 I use all the time for just about everything in the garden) to no ill effects.. and in your case you will be getting rid of the varmits.. it will feel very very good..
That's just me.. but I have been growing on and off since 1963.. (well, in 63 I planted my fist seeds behind the pool hall and actually managed to get a small harvest of seeded bud) and I know how important this shit is for folks and I would NEVER tell them something I thought was going to hurt their work in any way, and I would never suggest something I haven't done myself in many occasions to great benefit.
I may of spoke soon if a guy is growing 'soil'.. Me, I am growing a harvestable crop, not roots and not soils .. I DO understand there is a difference.. this may not be the way for some of us fanatical soil growers (by fanatical I mean I wish I had that kind of space and ability too), but for a good mahy of us, it is a great quick effective fix to the lil nasties..
Good luck~ I myself would do it without hesitation, I couldn't live with a few more weeks of the little critterswhen i see them I want them gone totally in hours, I don;t like to fuck around that way.