What common household item can be used with a dampened towel to clean a thermal iron?

The best choice for cleaning a thermal iron with a dampened towel is vinegar. Vinegar is a common household item known for its acidic properties, which can effectively break down mineral deposits and residues that accumulate on the surface of a thermal iron during use. When mixed with a damp towel, vinegar is safe to use and will not damage the iron or leave harsh chemical residues.

Using soap may not be as effective in removing stubborn build-up, while ammonia and bleach are harsh chemicals that can potentially damage the iron's surface and may pose safety risks if not handled properly. Thus, vinegar is the preferred and safest option for regular cleaning of thermal irons in a hairstyling setting.