What I have doone in the past (for Damping rod type) is drain, put the plug in spray with WD-40. Move the fork leg up and down to allow the WD-40 to wash everything inside. Take the plug out, drain and then spray some more in the leg while movingg the fork up and down with the plug removed. I have not torn apart a Crtridge type so I am not sure whhhat materials are used to seal inside. A Damping type is all metal and Teflon. I have since started using Gas instead of WD-40 because it is cheaper and will leave less residue that will thin the new fork oil. Provided there is no rubber inside a cartridge fork Gas is the best cleaner.
Originally Posted by Gravity's Dog
"I came to the site for the bikes, and stayed for Jo Momma. I am constantly amazed, revolted, and in love with the ideas I see here. An extreme reflection of the human experience."