Just got through reading "The Glock In Competition" and in the chapter on cleaning, it says don't use solvents that will peel the nickel plating off of the connector, trigger draw bar or other plated parts. The book does name GunScrubber as a culprit, but does this include Hoppes? I've read labels today on several solvents in the local shop and not one mentions it may be harmful to nickel plated parts. How is one to know? I've been using Hoppes to quickly clean up the muck on the barrel and everything else, and then use Break Free. Hoppes okay? Also, I only use WWB. Do I need to use Hoppes for copper?