Man, do I have a tone of it right now, the result of months. I only clean it when the cart is out of the arm, sitting upside down, under bright light, with a tiny brush and toothpick with alcohol on it, very carefully!
I do not use usually use liquids on stylii, I do not use those sticky things, just the little stylus brushes with some alcohol if something on the stylus is stubborn. After 1000 hours the stylus still gleams under 400 power magnification, so my occasional brushes with the stylus brush, and very occasional use of alcohol on the short stiff brush (as opposed to dripping liquid on those longer applicator brushes) is sufficient. And safe!
I do not use usually use liquids on stylii, I do not use those sticky things, just the little stylus brushes with some alcohol if something on the stylus is stubborn. After 1000 hours the stylus still gleams under 400 power magnification, so my occasional brushes with the stylus brush, and very occasional use of alcohol on the short stiff brush (as opposed to dripping liquid on those longer applicator brushes) is sufficient. And safe!