Have never changed the fork oil before and have a few questions: 1) I was planning to switch to ATF as many people have. If I do this, is there a problem with the existing oil mixing with the ATF. I will drain the old oil and clean, but do I have to be worried if I don't get all the old oil out of the nooks, etc. 2) I have read about the need to keep everything clean. Is there a special cleaning cloth people use? Do I need to worry about lint being left behind? 3) Is there a special cleaner I should use? Is PJ1 okay? Thanks in advance for you answers!