Tetra Gun Powder Solvent is an ammonia-free, concentrated cleaning solvent specifically to remove powder and carbon fouling. Designed to facilitate quick and easy firearm maintenance, use of Powder Solvent will not only clean the bore of fouling, but it can also prevent future build up, potentially improving function and accuracy. Tetra Gun Care’s Powder Solvent is available in a 4-oz. blue glass bottle for $4.19. Contact: FTI, Inc., 8 Vreeland Road, Florham Park, NJ 07932; (973) 443-0004; tetraguncare.com.