Car: 1995 E320 with 216K miles.
I suspect the car has been running rich and the O2 sensor may have carbon build up. I want to clean the O2 sensor, perhaps with brake cleaner?
Anyone have success doing this?

I've been having idle surge problems.
Codes on module used to regularly come up as 4 & 26 which my indie informed was due to upshift delay area and not worth fixing.
Recently I got code 10.
Pin 14 came up clean. Pin 8 came up with fault code 4 & 13.
I Cleaned MAF, idle surge became slightly less severe.
I Cleaned EGR tube, no noticeable change.
I cleaned Cleaned Throttle body plate, very minor improvement.
Checked for Vacuum leaks, no noticeable change.
I can't find the fuel pressure regulator to check is fuel leaking when vacuu line is pulled off. If anyone can give me a clue?
Cleaned purge valve. At first minute the idle was still surging but it quickly impoved and after a 10 mile drive surge was gone.
The idle has gotten better but not quite 100% yet.
Which I think is due to the oxygen sensor being gunked up.