Just use water. The hydrogen peroxide is for killing powdery mildew and other fungus post harvest which is cool, but the H2O2 will also have an oxidizing effect on your buds which will make the cannabinoids "age" more rapidly which isn't a big deal if you go through it quick. I believe lemon juice would have the same effect.
I use a 3 tub/bucket wash. I cut off the big fan leaves (which could be optional depending on your drying conditions)and then I vigoursly dunk each branch 10 times each in each bucket and use a smooth pendulum motion to whisk most of the water out, then hang them to dry somewhere with good air flow. If the first bucket gets too dirty I dump it out and fill with fresh water and make that the third bucket and bump the other two down to be the second and first buckets and just keep rotating the buckets if necessary. The third bucket's water should stay clean. I've had a surprising amount of junk come off my buds post harvest with the bud washing e.g. dust, bugs, weed seeds, spray residue, etc. It's standard practice for me now. And if you're doing it right you shouldn't have any tricome loss. I've scoped the buds before and after and couldn't see any tricome loss. If you've got a scope/eye loupe you might want to check out your washing skills to see how it's affecting (or not affecting) the tricomes. It shouldn't be a problem though for the most part. Fresh cut plants seem to hold onto their tricomes pretty good even with vigorous dunking. Let us know what you think about it after you give it a try. Hopefully I making sense here too, ha ha. Also, the washing may add a day or so to your dry time, just FYI.