I have a question for anyone who's really familiar with Glocks... I recently picked up a Glock 19, gen 4. I noticed there is a gold looking lube on the rails that 1 friend of mine told me not to clean off, which seemed odd to me because i wouldn't think it to be a good idea to just let residue from shooting build up on the rails, and another friend told me its fine to remove and it can be purchased and reapplied. So question 1 is, is friend #2 right? Next question... i sprayed some remington stuff down into the grip area of the pistol, where i can't otherwise get to for cleaning, that says it removes build up and grease and such in hard to reach places. There isn't some other sort of special Glock lube down there that i should avoid removing is there? I just want to make sure i didn't mess anything up.