boreas
"If it sounds good, it IS good." E.K.E.
I clean funky ones like that all the time with a few shots of CRC's electronics spray cleaner and a stylus brush when it's a thrift evaluation and have found good tips under far worse
I tend to avoid using strong solvents on styli, especially bonded ones, out of a concern that the solvents will attack the adhesive that holds the stylus in place. There's also the matter of those same solvents damaging the stylus suspension.
John