i wouldn't put it in the washing machine...it is intended to be used in a bucket of water to soak the pads/towels. you don't want this stuff getting on your normal clothes in other loads you do.
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Snappy Clean is a powder that dissolves in 3-4 gallons of water – plenty of solution to clean several pads. Just drop your used buffing pads in the mixture and agitate the pads. You may want to wear gloves since the directions caution against getting the cleaner on your skin. Wait up to 15 minutes, depending on how saturated the pads are with product. Rinse out pads with clean water and lay them out to dry. For faster drying, you can put them on your buffer and spin them dry. You may still need to lay them out to totally dry.
Snappy Clean is bio-degradable and non-flammable. While it is environmentally safe, it is a citrus cleaner and will therefore irritate your skin with prolonged exposure. Due to its powerful cleaning properties, wear old clothes when cleaning your buffing pads.