When I cleaned my brand-new G19 for the first time, I removed the copper colored lube that came with the gun using Gun Scrubber. It's actually hard not to remove it if one wants to totally clean the gun properly. That solvent strips the gun dry. I read the manual and it said do not remove this, as it provides "long-term lubrication of the slide". Question: Should I go get some of this stuff and put it back on there or will I be fine? I actually can't even remember where under the slide the stuff was located. Anyone remember? Can I substitute something other than the copper colored lube?