Since I started shooting F Class cleaning my rifles had been a pain. I clean them back to bare metal, checking with a bore scope until it’s clean. Everyone has their own secret witches brew and I had what worked best for me too. But. I watched f class John’s review of thorough clean and figured I had wasted money on worse stuff. I wasn’t ready for what happened. I followed instructions on the package with the exception of using a 30 cal brush instead of the 7mm bore size. In 15 minutes my barrel was clean. No waiting no soaking. No 27 steps. Figured I would put this out there if you fought cleaning like I do. Here is before and after pictures of my PRC W barrel. The carbon ring was also removed without any extra effort.