I have washed, iron xed, and washed again my wife's van. There are several small tar deposits on the paint. My plan is to clay, polish, Klasse AIO and SG tomorrow (can't believe I took a day off to detail a minivan). Do I need to use something else to remove the tar or will the rest of the process do it ( they are very small bits)? If I need to remove it what should I use that I can source locally?