Bib Video Head Cleaner
Got this - I can't quite remember when or where - in the days when I still had a VHS recorder.
I don't know whether it works; never actually got round to trying it. But have no reason to suppose that it doesn't.
You insert it into your machine like a conventional tape cassette, press play; and that's more or less it. Full instructions on the box.
I'm in Islingword Street, near the Dover Castle.
William