The spinny thing is the head drum. The divots are electromagnetic heads, usually four for video in a HiFi deck. Be careful when cleaning them as they are fragile. Avoid using any kind of material that may snag in their narrow gap. I like to use a strip of white paper wetted with isopropanol, holding it against the drum and turning it with the other hand. Repeat that till the paper comes away clean.
Varyk@sh.itjust.works 2 months ago
Oh this is great advice.
I also recommend softly holding whatever moistened but not dripping medium you’re using up to the cleaner head divot line and spinning the head itself with your other hand.