kinda the same way u do fertalizers. Rinse roots and wipe leaves. Usually u only see this with soft leaved yummy plants like hibiscus. But if yr doing all the stuff ahead of time the plants will be cleaned before u put frogs in. Ive heard it takes two weeks fir it to clean natrally. But stores do use plant leaf spray stuff that's no good also. U sound like you're going all the way, river and all. Super!!! If yr going to use spring tails they can damage plants, and then u have 2 be careful of plant toxicity. Cuz frogs will eat spring tails.