Question about steam heat when hauling latex in a tanker

In the railyard we used hot water/glycol mix circulating through the railcars, as needed, to maintain around 100 to 105 degrees. we had a digital thermometer with a long probe inserted through the air inlet valve to monitor the cars. Needed a ton of rags, if you didn't get it clean right away, it wouldn't come off...asked Unical if there was a solvent...they just laughed and said NO.