You can't really find this on the ground anywhere but dilluted dish soap works well, isopropyl alcohol works great as well. That's what we use at my greenhouse. There's also this organic fish kind of soap that we use but I'm unsure of what it actually is...

As far as stuff you can just pick up off the ground, idk. That's where the damn bugs came from in the first place. Kill them with something they don't have a resistance to or are familiar to. I recomend isoprpyl alcohol. It literally dissolves them and their eggs. Is this indoor or outdoor?

SMG