Corrosive priming contains potassium chlorate as a rule. This stuff acts and resembles common table salt and attracts moisture. Any solvent which contains water will disolve it and carry it out. The old standby has always been hot soapy water. Any cleaner which has water or is water soluable works well. As far as fulminate of mercury goes it is not corrosive, but will cause brass embritalment, it doesn't cause corrosion or rust. When shot with black powder the fulminate is imbedded in the fouling and since most black powder guns were cleaned with a water system it poses no problems to the gun But in a smokeless cartridge the brass is not fit to reload. Some use Ballistol with water to clean the bore with good luck. After cleaning wipe dry, apply light, thin coat of oil. Of course it doen't hurt to check it everyday for several days afterward. The old G.I. bore cleaners were nasty smelling or made with water soluable oil to remove corrosive salts. Good Luck.