Bradhill,The best way to clean the clutch’s is to remove them from the machine. In order to the the primary clutch you must remove the dome cover.
Was the belt you swapped new?
I have removed the secondary clutch to replace the buttons and would like to disassembly it and give it a good cleaning and lube. I haven't had any luck getting the clutch apart, I'm assuming that would be the best way to clean it. Correct? Any help with the procedure would be greatly appreciated.