Something has leaked on the gray painted area just above the oil sump on the right side of my bike near the cluch cover and oil spout. I suspect the culprit may be oil because the discoloration is carmel colored, but I've never heard of oil discoloring paint. W-D 40 and mild rubbing compounds don't seem to work in removing the discoloration. I haven't tried any other products because it got late in the evening. Any suggestions on what is causing the discoloration and how to get rid of it?