The only way to get rid of oxidation 100% is by wetsanding. take the advice earlier and go over to bassboatcentral.com for great detailed instructions. When you are done, be sure to protect it with a good wax or protectant like BTS (Bow to Stern) to prevent the oxidation from returning. It is from exposure to the sun and elements without being protected. Remember there are a ton of "ideas" to make your boat shine, but not many actually protect and prevent. A good example is Pledge furniture polish. Those shines will just be temporary and you will be back to square one in no time. Wetsand and then BTS