Did the job
My Blackstar HT-1R's sound was intermittently dropping out on the overdrive channel. I was about to send it back to Sweetwater to be serviced (for free, under the second year of their two-year coverage), when I realized that every time I pushed the overdrive button, I turned down the gain knob, and it was the crackly gain knob that was causing the sound dropout. I ordered a can of Craig Faderlube and blew it into the offending potentiometer assembly (and the others). It cured the sound dropout and almost all of the crackling was gone. I did start to hear crackling again on a couple of the knobs before too long though, so ordered a can of this DeoxIt and did the same thing. This stuff completely eliminated all the noise from the knobs.
So very effective, but BEWARE, the spray action on this is much more powerful than the Faderlube. Faderlube came with a very thin applicator straw that made it easy to put very small amounts into pots. This DeOxit has a wider straw and comes out in a very powerful spray, so it is much harder (impossible in my case) to spray only into the pots. It splattered all over before I learned to cover the area being sprayed, and there was excess liquid that took a long time to dry after I'd cleaned up what I could. So it's a bit hard to handle, but definitely blew away my potentiometer crud. I imagine it will cure problems with other devices down the road.