cartridge cleaning? Not the stylus........

Got an e-mail from Soundsmith saying my cartridge was very dirty. Dirt and debris he said. I asked about compressed air and he said no way. "We use funtak"he said. Funtak is a putty you stick things to the wall with. Can't picture it and I have bugged them enough. I wash my records(spinclean) vacuum and use Mr. Clean block and Zerodust every side. What do other people do?
Thanks