Sourdough Bread Proofing Mat for Bread Riser, Bread Heating Pad with 59 â-140 â Adjustable, Warming Mat for Sourdough Starter. To clean the sourdough heating mat, simply wipe it with a damp towel. When using the Dough Heating Pad at temperatures below 83 degrees, it may feel cool to the touch, but the temperature of the sourdough warming mat is accurate.
