I don't like mixing, while it doesn't hurt, you can never be sure of what is causing your issues. Say you get insane etching when you mix the two. What are you going to blame? Unless you intimately know the products, keep them apart. Its not like Z2 will cause your paint to peel. If you leave bird crap on the paint longer than a day or so, you might get minor etching that UNO will easily remove.