I just used the blue thing but when the car was very dirty I found that in some places it took two or three passes to clean it so I sprayed the car first and then drove. with blue material. Then I got this pink thing. Even in the middle of winter, if I haven't washed my car for 3 weeks, you get a clean, waterless car wash. I go through the whole car with the pink thing once, then the blue thing the second time. Very happy with the result.
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