Breakthrough Clean Technologies Copper Remover safely and effectively removes copper fouling and is 100% petroleum and ammonia-free. Its virtually odorless and biodegradable formula easily removes copper fouling and minimizes future copper build-up without giving off any harmful or strong offensive odors found in other copper removers. Usable on all types of bore steel and won't etch or harm the barrel.Features: Quickly breaks down copper fouling and minimizes future copper build-up 100% ammonia free-User safe and eco-friendly Safe on bore steel-Won't etch or harm barrels Virtually odorless and is biodegradable and petroleum-free