I'm a newbie here , but a long time OCD'er in auto care. I bought a Flex 3401 last year and did paint correction to my black 2011 GMC Denali. I was not fully schooled on the process at the time and my results were not optimal. I have since bought and read the book on DA polishing and feel I am more ready than last time. I am still a little confused on pad usage and cleaning. How long should I go between changing/ cleaning my pad? And what is the best method of cleaning the pad? My truck is in good condition and would not need a lot of correction, but I want to get the most benefit for my time spent and get the best results that I can. Thanks for any help.