Hotsy Defoamer - 4 pack, 1 gal Pacific Bay Equipment Sale! from $369.00 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. This defoamer is added to parts-washer cleaning solutions to reduce foambuildup. Hotsy Defoamer does not interfere with the detergent’s normal cleaning ability.