A common solvent for wax is mineral spirits, the ones you used won't work. Have you tried slightly warming in a 200 oven for 10 minutes, then see if a putty knife will lift the majority. Remaining residue can be scraped with a card scraper or single edged razor blade used as a small scraper, then cleaned with a rag and mineral spirits, the real stuff, not the low odor. Don't soak the wood with the paint thinner or it could cause wax to sink into the grain deeper. Shouldn't be a problem after the work you do, cutting, shaping, sanding, but nitro lacquers can be problematic if wax remains.