Agree with both above also ... white spirit is best i'v come across for oil , tar , paint etc ... call it stoddard solvent , sounds fancier

If its not coming out with white spirit , acetone , isopropyl alcohol , your often screwed .
btw ... mix a few drops of detergent ( liquid formula 90 ) for eg ...in a spotter bottle with white spirit , and leave it couple of days ... forms a nice white spotter gel , for some strange reason .
