Try using Dawn dish washing liquid. It is known for striping wax. It is also a good cleaner for removing the film that you speak of. Afterwards, you will have to re-wax the car and go back to a mild car wash liquid for normal cleaning.
Water Wetter
I have used this product in my 2001 roadster since it was delivered new. I have had no real data to compare my pre-additive temperatures to that of the new coolant mixture, until the car went in for the 2001 oil ring service bullitien. This service required change of the coolant...
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