<p>I can tell you from what I have heard from someone who has graded these exams for a very long time, what happens is that they have a team come in and basically clean it up. Then, the grader has to wear gloves and stuff and then simply grades your paper like a normal one. Since there are thousands of people who take these exams, you will not be the only one. Your test will be treated seperately from all the others, but this should not impact your score.</p>