The mold release compound is a logical cause as it would act like an oiled tire. That would break free with very little throttle, particularly on a 1.3 liter engine.
Do not use any chemicals on tires. They are formulated to exude protective compounds throughout their life and any harsh chemical could affect this, including reducing the life of the tire.
You can try plain Dawn and a nylon brush. I do not know if that completely solves the problem and I might not rely on that but also do whatever you can to get some long straight time in and merely coast the corners.