Metal clamps can be found at hardware stores.

A mixture of equal parts of a gentle, neutral pH detergent such as Dawn dish soap or a baby wash and water can be used as a cleaner instead. [4] X Research source Vinegar and vinegar-based cleaners are useful for removing smells, but vinegar is an acid and too much of it can damage the belt’s integrity over time. Use baby wipes and delicate fabric cleaners instead.

A second coating of cleaner can be added to deeply stained belts.

For recurrent mold issues, spray on a mold preventative such as Concrobium Mold Control or Mold Armor while the belt is still damp. Try to choose one that doesn’t have bleach in the ingredient list.