copper removal

[gohring3006]

How do you guys know when its safe to leave in over night is it the lack of ammonia? Or do you rely on the manufacturer recommendations. I have some gun slick that is ammonia free but it says nothing about extended time?

 

[DocUSMCRetired]

How do you guys know when its safe to leave in over night is it the lack of ammonia? Or do you rely on the manufacturer recommendations. I have some gun slick that is ammonia free but it says nothing about extended time?

I use Boretech which tend to be on the less harsh side.