Thanks for all of your replies.

Been using the TASCAM Rubber Cleaner on venerable 4 and 8 track cassette
machines: a TASCAM Porta Two since circa 1988 and a TASCAM 688 since the early
90s.

Tho' I'm not recording on either very often these days, kinda want to keep them
around and running for awhile, thus my interest in the CaiKleen RBR.

Distilled water, Windex, and the other choices are also good to keep in mind.
Certainly, they're cheaper and handier options that can easily do the job at
hand (lowly cassette multitrackers don't generally come up against sticky shed
and other tough cleaning jobs).

But to forestall the inevitable, esp. a screwed up pinch roller, I want
something to condition as well.

Plus a good friend wants to transfer some old 4 track cassette stuff to
digital. I'm lending him the Porta Two for awhile and want to have some
road-tested rubber cleaner/conditioner to pass along with the machine.

Given the testimonial re TASCAM reel-to-reel machines, CAIG looks good. And is
likely useful for other garden-variety cassette decks as well. (Since treating
cassette pinch rollers is a small & shrinking part of CaiKleen's potential
market, guess it's not surprising there's no mention of the application in the
CAIG info.)

Thanks again for all your help/back to lurking,
Kevin Seward