Could be the person you spoke with at Kimber wasn't aware but according to gdurfee @ Kimber's Unofficial Forum "they recommend AGAINST using anything containing ammonia because it may attack the finish.
So, the message is: beware using products like MP-7, Sweets 7.62, or Hoppes #9 Benchrest because they all contain ammonia. What Kimber recommends is Shooter's Choice "Extra CLean" -- it has NO ammonia. I don't know if any of you have any experience with this stuff, but their claim is that it works for powder, copper and lead fouling."
My personal experience:
I've used MPro7 and Break Free CLP on my Pro Eclipse and have had no problems with the finish coming off...
So, the message is: beware using products like MP-7, Sweets 7.62, or Hoppes #9 Benchrest because they all contain ammonia. What Kimber recommends is Shooter's Choice "Extra CLean" -- it has NO ammonia. I don't know if any of you have any experience with this stuff, but their claim is that it works for powder, copper and lead fouling."
My personal experience:
I've used MPro7 and Break Free CLP on my Pro Eclipse and have had no problems with the finish coming off...