Home Depot sells it & since it's a big chain they're pretty reasonable. I too prefer the look & sound of clean cymbals.I did not know bar keeper friend came in a liquid.Ii have been using the powder.
on the west coast Kleen King is the same thing, YOU MUST GO WITH THE LATHE GROOVES!
I personally prefer the sound of clean cymbals.
If i'm paying $250 for a crash i want it to look like a $250 cymbal not a $2.50 cymbal..lol