If your solvent evaporates clean (meaning leaving no residues, you can do a test by just putting a little bit in a bowl and evapping, then rub your finger on the bowl and lick) then you really have nothing to worry about.

So what will be left will be a type of crystal salt? Are you sure licking some residues won't make you sick >.<? I am trying this now, so I know if Diggers is fine to use .