I was a computer operator once…
We did clean the glass/metal read/write heads of the tape units with 100% (99.99999%) pure ethanol.
So far comparable with what is done here for the IBTS, but we had always to do another step: drying the heads directly after that with another dry and clean cotton swab to take away the alcohol solution with possible dirt. We had to take a new swab for that, but most of us shall use double sided swabs, so…
The alcohol also cleanes the inner side of the front very fast !
Oh yes, I do use the 96% ketone one myself, it’s much, much cheaper and working well.