Local LE training we never cleaned in training or at the range for requal. That was done at home on your own time. Just don't bring a dirty weapon back to the range. You will regret it!
I guess it depends on the agency. During Cincinnati Police recruit training, we were required to clean our duty firearm [S&W 5946 9mm] at the range immediately after that day’s firearms training. During annual in-service firearm training [requal], it was your choice whether you cleaned your duty firearm at the range or at home. Yeppers…if you showed up to the range with a dirty firearm [and they noticed it], you’re going to get a major butt chewing.