I used this once and its works great. I like the concept of it removing particles and debris off the car before it is scrubbed down. This is the 1/4 gallon version that I bought this from detailed image for $60 + shipping. I am selling because I am not able to wash my car at my condo so this is useless.
http://www.detailedimage.com/Gilmour...allon-Tank-S1/
Price is $45 shipped.