It's actually kinda fun to watch on long neglected glass. You know that 'Oxyclean' stuff, the one that 'releases Oxygen bubbles'? They use that chemistry as well. You see trails of bubbles, like in a beer glass, coming from the junk as PBW 'eats' it's way underneath and floats it clear.
I've had a lot of fun with pulling out a small jar, asking a friend for his nastiest WT, putting a bit in and filling it with the hottest water possible from the sink. In a minute or two it gets rolling and they get fascinated. I bet I could get ten bucks an ounce on the spot..........
Sure it does, cleans it right off.
Oh, you wanted to use it......... I've never tried, I don't like the idea of vaping residual PBW. However I think it would work fine. PBW is a detergent, it breaks the bond with the glass and floats stuff away. It doesn't dissolve like ISO. In theory you can wash (rinse) the solution to remove the PBW, but I'd be concerned that some part of it might actually dissolve into the concentrate.
If you want to reclaim, I suggest you get the bulk out with an ISO soak in the usual manner, then a wash in PBW to remove anything left and a rinse. BTW, it contains rinse agents so it 'rinses clean' with a minimum of water changes, always nice in a WT. Good stuff.
OF