Green Mobile Wash offers a 100% guarantee on all products. You must read all directions when applying the solution onto your vehicle. After your fist wash with this product, if you still are unsatisfied. We will gladly accept the return of the product with no questions asked with ½ of the bottle left. Please send it back to the 3395 S. Jones Blvd #419 Las Vegas NV 89146. Please fill in the boxes below so we can process your return and return the product to us.