For string wax buildup, scrape off what you can with your finger nail. To get it completely clean use lighter fluid soaked into a clean cloth to rub any residue off. If you work fast it shouldn't hurt the underlying finish. Once clean use a good quality floor or car wax on your limbs (true wax - some car "wax" is not true wax). I use Johnsons floor wax on my bows, a can will last a lifetime if you only use it on your bows. The floor wax will make it easier to wipe off future build up and protect the bow.