I generously apply a coat of Weapons Shield when I first get a new weapon and let it "soak" in over night. Then I clean the weapon and apply a light coat of CLP where needed.
After that, I used to clean every so many rounds, now I clean after each firing with CLP, and ed's red if needed to get any tough crud off. Then I coat again with weapon shield and let it set for a few hours, clean it off, and apply a thin coat of CLP. Good to go. Have not had a single malfunction since using this "treatment" and have fired the weapons in as low as 10 below and as high as 110. One weapon, the Colt, has close to 120,000 rounds through it and the S&W 15 now has over 18,000 rounds put thru it, not a single malfunction, feed problem, or anything else, have not even had to use the bolt assist.
I also use a mixture of P mags, sig mags, and the good old GI metal mags. I dissambled the GI mags, soaked all the parts in weapon shield, wiped off the excess, re-assembled them, and have not had one malfunction with them after doing that.