Seeking help with electric heating of heat transfer oil!

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We use electric heating elements to heat the heat transfer oil in the trough coils, thereby maintaining the temperature of the material at around 110 degrees. However, the temperature at certain areas of the heating elements is relatively high; as a result of prolonged use, the heat transfer oil undergoes coking, leading to a decrease in its flash point and initial boiling point, as well as an increase in its viscosity. The area surrounding the material heating tank is hot, but the interior space is not; a blockage inside is suspected. It can no longer meet the requirements for material insulation. Is there any good way to remove carbon deposits and sludge inside pipelines and coils? In this case, can diethylene glycol replace heat transfer oil as a heat exchange medium? Is there any data and theoretical support for this?