Moose Milk (1 part emulsifiable oil such as Ballistol + 1-10 parts water) works great to dissolve the salts. Follow with emusifiable oil patches until all the water is removed. Murphy's Oil Soap also works in water solution, in fact, anything that is a good surfactant will improve the efficiency of water actually making contact with the soluble salts which is why Windex became the darling of some corrosive ammo shooters, low surface tension not the tiny bit of ammonia actually removing any copper. I use 1:10 Ballistol Moose Milk followed by 100% Ballistol when shooting corrosive surplus ammo and black powder. I use the Moose Milk as wiping solution between black powder shots. Whether it is any better for that use than spit or tap water I really can't say.