Yes Scotchbright is around here too, I use it on my urethane spares bowling ball for a quick wipe down when the hook starts to fade.
I'll see if they will let me (or our tame gunsmith) do that with them.
As for brass cleaner will Solvol Autosol be any use?.
I didn't check the Python but I would have thought (rightly or wrongly) that if you were the owner of a Python you would keep it spotless. I wiped it down externally with a cleaning cloth after each 10 I put through it, I do the same with the club guns but I never see anyone else doing the same thing.