Step 4
The paint should be totally clean of the marks now!
It would be a good idea to now apply some Carnauba Body Wax, Lazy Wax or Fully Slick spray sealant, to aid in the protection of the now clean surface and make it easier to remove any sunscreen should it happen again in the future.
If the sunscreen marks are still there, due to it being on the paint for an extended period of time (we are talking many months to years), you will need to get the paint professionally machine buffed to get rid of the marks.