I have used all sorts of store bought and home made concoctions for thorough cleaning, over a large part of my lifetime ................ including auto windshield washer fluid ($1/gal), but the absolute best I, and many friends, have ever found is a 3 part mixture of alcohol, peroxide and Murphy's Oil Soap. You mix it in equal parts and keep it in an opaque bottle. Cheap to make, and in many years we have found absolutely no drawbacks to it.

After using it, I dry the bore thoroughly, then RIG it. Bores will stay free of any signs of red for years.

SRH

May God bless America and those who defend her.