graymachine: Yeah, that’s pretty much what I need to do.
moldyboot: I do use adjustment layers for that purpose. So nice to have them. I had myself in a situation where I had about 40 layers (not 10, that was just for the example) and there was the same levels effect applied to many of them (not all of them) and there were also other effects in the mix; so the Remove All command wouldn’t work for me either.
Thanks for your responses!