Yes, you can get the rifle white glove cleaned. In the old days of boot camp, they would take your rifle and inspect it with a white glove. I think they stopped this mid 2000s timeframe.
You generally clean it across 3 days and you can get it pretty clean. However, what a lot of folks found out is to use barrack showers grade hot water. Not the kind you find in a typical house, but the kind that you can use as instant hot coffee type water. So you brought the rifle with you to the showers and next day it's magically the cleanest rifle in the group. Some people try to do it with CLP and end up with completely white rifles down to the bare aluminium.
Some of the old timers might still do it today. I heard of people putting glocks in dishwashers. Some people might think it'll cause rust but so long as you're using hot water and you give it a good shake, it should evaporate quickly.