Last year I did a range qualification with C7 and 9mm Browning. The cleaning regime was quite unlike any I'd done before. Hot, soapy, nontoxic water-based cleaner and plenty of drying rags. The room didn't smell so horrible you gagged and had a headache for the rest of the day. Once the obvious carbon or grit was off and an even sheen of CLP applied, the staff would inspect the weapons.
One Sgt even said the heretic words that I thought would never be said, he would accept a dirty weapon as long as it was clean. Which I took to mean, brass shavings or dirty barrel were a No-No, but tiny fragments of carbon in the corners were fine. He urged us not to clean too vigourously because that was how the finish got worn off and why parts didn't fit well anymore! For a Browning HP owner who leaves his guns half-caked in 'running surface' carbon, that attitude was a revelation.
** This same young Sgt had a Meritourious Service Medal from AFG for leading his convoy escorts regularly into bad guy country and bringing everyone through safely. **