The use of lead free solder can lead to increased oxide formation on the surface of the solder tip these oxides must be carefully removed as they soon form a black unwettable separating coating the conventional cleaning method with a damp sponge can cause a sudden drop in temperature reducing the service life of the solder tipcleaning of the solder tip in the wdc dry cleaner involves use of a special wool spiral in the preliminary cleaning stage the contaminated used solder is knocked aga