Wax slowly erodes away. In the real world, it goes away more quickly than people replenish it. UV rays, washing, etc. No, a quality wax will not buildup over time unless you apply it over religiously (like twice a week or something) and, even then, it will not "bake white". If against all odds, you manage to apply it too often, a simple wash with detergent will strip it right off.Pretty sure all waxes have a degree of wax buildup, eventually. Not a fan. Others like lacquer thinner. It's clean, but a bit harsh of a chemical. What's next, Aqua Regia? I like the KISS policy. Cold water only.