2 quick points before I go in the bathroom...

1] noise & click removal software needs to be used sparingly
on lowest auto settings, or ideally very carefully on manual.,
to avoid unpleasant digital artifacts and tonal degradation.
Obviously, it's wise to keep a safety copy of the original digital transfer sound file
without any noise reduction applied.

2]Fast forward & reversing tape on elderly poorly maintained machines
can be like playing Russian Roulette.
Be prepared for tape chewing and mangling.
The safest but most time consuming alternative is patiently and carefully
winding the cassette spool with a suitable sized pencil or biro.
Tapping the case on a table and gently winding sufficiently with a biro to take up slack
before playing was another useful tip from a byegone era...