Well I got a big spray can of it for under 4$, and it didn't take much to clean the intake, I was thinking of using it to clean my brake calipers, I'm about to replace pads, rotors, and paint the calipers, was thinking maybe I could use it to scrub all the dirt off the calipers before all that and rinse of course...I imagine you could use it for rusty bolts and tools maybe ?