I received an e mail from Saris with a new contact person, Curt. Curt said they have been using the same foam for 20 years and have never seen this. He told me to take the car to an auto body shop to see what it will take to remove the stains. He asked me to cut the protective foam off of the Guardian II and mail it to them for testing. They sent me an upgrade rack, from GuardianII to a Bones 3. This was fed-exed to me within two days of speaking to him. So far their customer service is above and beyond anything I would have expected.