If anyone has this issue with there sxr here is the cure all answer to fix it. I tried EVERYTHING to get rid of it but nothing ever worked.....until my buddy literally took two minutes and sprayed it down with acid. Its called on/off boat cleaner. You can pick it up at west marine or any marine store. He basically sprayed it on then rinsed. DONE. Looked as white as the day I bought brand new, and it lasts. It's been a couple months now and still looking good.