I've always done it sing I began growing again. Once you see all the crap that come off your harvest, I think you'll be a believer too.
I use two 5 gal buckets. One bucket has plain room-temp water (not hot and not cold). The other has water but I add 1/2 cup each of lemon juice and sodium bicarb' (baking soda). I add the BS first and stir well to let it dissolve. When I'm ready to wash (immediately after chopping), I add the juice and stir just to combine. Swish colas gently, rinse, allow to drip dry, hang to dry like usual.
Dirty wash water on left. Rinse water on right. Don't smoke bug and bird shit, or other nasty stuff (insecticide, dirt, small critters, cat hair, etc.).