Mothers Mag and Aluminum polish works really well for me. You can pick it up at any auto parts store or even walmart. Personally I think its about the best stuff there is. About your suspension question, The two blue "things" on the top of your forks are PRELOAD ADJUSTERS. When you adjust them, they are measured in "clicks" they will click when you turn them. Be sure to turn both of them the exact same amount when you do this. They will put more/less tension on the springs in your forks, thus either firming up your suspension or making it softer. I'm pretty sure they even have a H and S for hard and soft with arrows pointing the direction you need to turn them for each of these settings. Hope this helps.
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