Ask if they smoked in the house. Seriously. I helped a guy in the bee club with a cut-out (my first) this morning. It was in a good friend of his rental house so we weren't getting paid but i wanted the experience. Anyway, i took home all the extra comb and uncapped honey and promptly melted it down, as it was melting i smelled it, cigarette smoke. Not sure if this was is even usable for anything. If I ever do a cutout for pay i'm going to tack on a surcharge if the house has been smoked in because the wax is useless too.