I recently purchased a turntable setup that had a Shure Type IV cart with a Jico VN-45HE SAS/S stylus.
I put the stylus under the microscope to check the condition, and found it to be very dirty.
The stylus brush did not budge the buildup, so I (in a nerve-wracking process) used a needle to slowly chip at it.
After about 10 minutes, I was able to get just about all of it off.
I used a stylus brush throughout the process to help brush away what I loosened.
I really wasn't expecting much in terms of sound quality improvement. It already sounded great to me, and I just wanted peace of mind in having a clean needle.
But cleaning it helped bring out a lot more low-end. This was a very welcome result!
Please see below for pictures:
Dirty Jico Stylus:

Clean Jico Stylus:

Bonus pictures comparing Jico to Original Shure stylus:

Jico top view:

Original Shure top view:
