RE: Who has the best homemade cleaning solvent recipe?
Encore50.. not meaning to insult a product, but TC #13 is a fowling remover and that's about all. Thompson Center pushes their natural products but #13 will not remove copper, lead or plastic fowling at all. It is all right for swabbing a barrel at the end of the day in my book.
Some homemade cleaners I personally use is a cleaner called Simple Green. It will really cut fowling excellent.
I also use isopropyl alcohol and windshield washer fluid mixed.
Brake Cleaner will work in the barrel but do not get it on the stock of the rifle.
Simple water with a little dish soap will cut the fowling out of the barrel.
M.A.P. which is a mixture of Murphy's oil soap, alcohol, and hydrogen peroxide. Just be sure to oil the barrel after use because of the peroxide in the solution. It does cut hard to remove fowling.
Kerosene will remove plastic fowling, but again.. don't get any of it on your stock or plastic sights.