By using a proprietary alloy of stainless steel, nickel, silver, Monel and zinc, Big 45 Frontier Metal Cleaner is softer than gun bluing yet harder than rust. Thin, ribbon-like strands of the alloy are coiled and woven together to form a “sponge” for external cleaning. The sharp, razor-like edges within the scrubbing sponge scrape away surface build-up, and, by cutting a small piece from the pad and wrapping the strands around a barrel brush, can be used to remove copper and lead fouling from bores. Price: $6. Contact: Big 45 Frontier Metal Cleaner; (800) 342-1548; big45.com.