Time for another check in on this subject.

I used to clean my casptan rollers once a week unless noticeably dirty.  Life was good.  Others began doing it every morning on our cassette decks and now and the decks seem to be more problematic lately.  I'm starting to think you can over do it.

Maybe another factor is advantages/disadvantages of tap water vs reverse osmosis vs distilled vs deionized?

Thanks in advance, brain trust.