EZ Clean is a water based solvent with a slight citrus scent. It works incredibly well on a wide variety of Carbon based residues including modern gun powders and it is particularly effective on the residues left by Pyrodex, Triple Seven, and Black Powder. Small parts should be soaked for up to five minutes and then flushed with warm water and thoroughly dried. It is important to oil these parts immediately. The inside of the barrel can be treated with this solvent by soaking a patch, pushing the patch through the barrel, and then letting the solvent stand for one to two minutes. Apply a thin coat of oil to metal immediately after use. Note: Do not leave this cleaner on metal for more than 5 minutes, as it may oxidize the metal.