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Dry ones are abrasive (wear the heads). Wet ones generally aren't, but they are a bit trickier to use.
I have had 2 Betamax, and 5 VHS machines. And I've only ever had the need to clean heads on one of them - a Panasonic SVHS machine as it happens. It's my suspicion that this particular machine has a microscopic flaw in one of its heads, which collected tape residue. The more I cleaned it (with a dry/abrasive tape) the less often it needed it, which supports my theory. And picture noise was only ever visible on SP, never LP so that also supports my theory (different heads are used for LP).
As for the others - none of them has ever required cleaning nor shown any symptoms to suggest the need. (S)VHS tape is very slightly abrasive anyway so it should be self-polishing.
So - get one by all means. But only use it if/when you have to. Not as a matter of routine.
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Nigel
Except on matters of forum moderation, the views expressed in this post are my own, and do not necessarily reflect the opinions of AVForums.
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