Ed's Red bore cleaner. A homemade concoction that I use for a lot of things, contains Dexron ATF, kerosene and mineral spirits. I leave out the acetone. 3 quart cans poured into a gallon can and I have enough for decades. The last batch I used citrus based mineral spirits, it makes it smell good and I cannot tell the difference when using it as a tapping fluid or as a bore cleaner.