I was initially quite dubious about GrooveJuice - internet searches lead me to belive it would remove logos; but since I got it for free I thought it was worth a go.
I tried it out on some cheaper (but still b20) cymbals and it worked great, so held my breath and sprayed it all over my K's... No problem at all - I can imagine that faded logos might be affected (where the metal is partly exposed), but the GrooveJuice didn't seem to attack the ink at all. I've cleaned up both brilliant and traditional Zildjian and Sabian cymals with no problems with this stuff.
My only word of advice - follow the instructions to the letter - spray on, wait 30 seconds, rince off, repeat if needed. No scrubbing. I did try this stuff on a Paiste B8 cymbal (just for interest and against the advice on the packet) - it turned it pink and basically ruined it, so this is only for B20 cymbals.