sorry i aint been on here to answer your questions. firstly no i dont make commision its just a plug for a friend. i am selling the stuff for him too. it was my idea to put it out on the forums that im a member of. this product does not scratch your paintwork as the compound in the solution lifts the dirt off the paintwork and holds it in the solution until it dries ( which is a few seconds) into a powder form which is then wiped off with a clean cloth. it does remove all bugs/tree sap and all marks. leaving your car polished and smooth. as for the amount of washes, well this really depends on how big the car is and how much you apply. i have got over 20 washes out of a bottle on my starlet. so it really depends. and you dont have to but sponges,bucket,leather or the polish so this really does work out cheaper. and down this end of the country we have a hosepipe ban so no water anyway. it really comes into its own at car shows. who wants to be hunting around for water and stand there at 7am washing and drying their car. it honestly takes me 10 minutes to clean my car and it can be used on windows and wheels. if anyone would like to ask any questions. us the contact part on the website www.miracledrywash.com and you can askhim urself, but im always here if you wanna ask me anything. thanks for your comments guys.