thank you for the assistance, about making the mix weaker but wouldn't it damage the glass and stainless metal on mercedez or BMWs. I dont just do expesive vehicles, the auctions we do are police impounds, i'll just like to move a little faster than brushing each single car. Here in Los Angeles everything its so comperative you have a mobile car wash almost on every other business, its hard when you have to compete weekenders.