Washed my car yesterday, sealed it and then and noticed these marks on the rear wing just above the middle strip (photo doesnt show it very well), they are very light as you can see, however i want to get rid of them, is this just a little bit of overspray/paint oxidization that can be clayed off? I need to clay the whole car anyway really, however i know i will need to strip the sealant layer off first, will the clay do this for me? If not whats the best stuff to use?