Woot offers Sun Joe SPX-FCS1G Premium Snow Foam Cannon Pineapple Pressure Washer Rated Car Wash Soap and Cleaner, 1-Gallon for $14.99 (orig. $29.98) free shipping with Amazon Prime.

Product Description:
Made for pressure washers. Give your auto cleaning blast aboost! High viscosity foaming auto Wash specially formulated to capture& gently rinse away dirt particles to leave behind a superior shine.Gentle on paintwork, tough on Road grime

• [CONCENTRATE]: Pressure washer concentrate formula
• [SAFE]: Biodegradable, non-toxic, and bleach-free
• [VERSATILE]: Can be applied with a mop or brush to clean vinyl, aluminum, wood, brick, and more
• [UNIVERSAL]: Consult your pressure washer model's manual for specific instructions regarding use of detergent
• [DEEP CLEANING]: Removes dirt and grime, yet safe for wax and sealants