You should really start by making a proper soil mix to transplant your clones into. If the mix is right it'll need just occasional fertilisation, which you can dial in a very easy way.

Bud wash came from 420mag as a way to clean after treating plants with brix raising sprays. I washed my buds twice or something to check if I could detect any difference and I don't think you need it if your produce is clean in the first place. But it makes the bud smoother sometimes.... kinda choice thing, but not mine :)