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What dissolves burnt oil ?

Question asked by Robert Schuon on Jul 15, 2013
Latest reply on Jul 18, 2013 by George Schaefer

We have a film laminator that has an 8"dia. x 24"  roller that is heated with oil and has some passages or baffling inside. The oil is heated and pumped through the roller providing a large thermal mass. After years of using the wrong oil and overheating we have plugged the roller, not completly but to the point that we have cold spots and that makes the operators want to turn the heat up. compounding the problem The roller is sealed and cannot be taken apart for cleaning.

Is there a chemical process that could be to dissolve the hard crusty burnt oil in the cylinder ?