I think that Bushy is probably referring to ammonia based solvents such as Sweet's or other cleaners that have a maderately high pH.Hoppe's #9 will stain nickel and thats why the products label warns about its use on such surfaces.Ive seen it first hand with a nickel 586 I had back in the 1980's.
Ammonia based or even moderately high pH cleaners can have an effect on anodized or bare aluminum regardless.Particularly if left in contact for an extended amount of time and not rinsed or wiped off and or left exposed to high temps.
Best solution is to keep bore cleaning solvents in the bore where the belong,and only for the specified amount of exposure time.Thats why I say use a bore guide as it keeps solvents out of the receiver and barrel extension.
The solvent in CLP has no effect on any of the surfaces as its pH neutral.
As far as CLP ruining a chromed bore....well I want to see the evidence.I think that after 20+ years if Break Free was going to cause issues it would have been seen by now,particularly with the military.That is to include the old chlorinated solvent version of the CLP during the early,mid and late 1980's.
The fact of the matter is that CLP does not do anything but help keep the metal clean and protected.Otherwise I say proove it.The Mil-spec sure shows no issues even with copper or zinc etc..
Problems with clp damage has not happened,or showed that Im aware of.And I used and followed Break Free for right at 14 years as a gun oil fanatic.
Maybe this is part of the myth that the PTFE in the Break Free,if in fact its still there which I have my doubts,will cause damage to the bore by the acids created when the PTFE is burnt or by causing uneven wear to the surfaces as the PTFE is not uniform on the surface.I say BS in either case.I have yet to see hard evidence of either.Just speculation and rumor.Plus the fact that PTFE does not stick to anything even when crushed,which happens at about 200psi from what I understand...if anything it gets blown out of the bore when the round goes bang.
Again no issues with my weapons in 14 years of using Break Free.Not to mention the high percentage of PTFE in the Mil-comm that I use.No problem there either.
I say all the CLP damage stories is BS.
If you want to worry about something worry about a funky dry bore thats just waiting to rust.Not to mention the abrassive carbon residue that grinds away at the bore every time you pull the trigger sending the bullet down range.Lets not forget the erosive nature of the exploding gases either.
Accuracy issues...well maybe that layer upon layer of copper building in the bore should addressed once every ten years too.
Whats the gunshop commando recommend?