I like the gun slick brand. First application, I usually push out blue and black, and then I do a second application and it pushes out just foam. Makes me feel good to see that big of a difference. Makes me feel like something is happening. I may be wasting foam by doing the second application but it makes me feel good and I've cleaned 5 different guns at least four times and the can barely feels lighter. That is good, cheap piece of mind.