It works fine in my 9mm pistols.
I had FTE in the CZ 75.
I ran a 45 cal brass bore brush dipped in Hoppes #9 up there on the end of a drill motor..
Voila! It eats that stuff like peanuts now.
I stopped all shooting a month or two ago. Can’t replace any ammo used on the range.
Depending on caliber, I’m down to 400 to 600 rounds for each gun and I don’t want to dip below that level.
It sucks.