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I wouldn't use alcohol on video heads. Ampex recommended using their head cleaning solution, or, if you didn't have that, Xylene. This is from the manuals on Ampex 1" type C machines. The reasoning for this is that alcohol increases the tape to head drum friction. I have had tapes that wouldn't even run through the machine after using alcohol, but ran fine after cleaning the tape path with Xylene. The effect is less on consumer vcrs due to the smaller head drum but I would still stick with Xylene for vcrs. Also using alcohol containing water is a bad idea for any heads because the water will get down in the gap and cause rust, especially with repeated use.
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