A foam pad should be soaked in water for a few minutes before using it. Then, use a cloth to dry the wax off.
Yes, polishing pads can be machinewashed.
To clean a 3m wool buffing pad, first remove all of the dust and debris. Then, use a damp cloth to clean the pad in a circular motion. Finally, dry the pad with a dry cloth.
To clean a microfiber polishing pad, first place it in the dishwasher on the low setting. Once it has been washed, remove any excess water and dry it off.