Has anyone seen this spot-free wash water filter?

I have a spot free car wash method. It's called a towel. Water softeners and filters might help a lot, but I never believe it when they claim "spot free".
 
I have a spot free car wash method. It's called a towel. Water softeners and filters might help a lot, but I never believe it when they claim "spot free".

Towels and even leaf blowers sometimes don't blow off water fast enough before they have time to dry on the car in Florida summers...

Even a lower amount of waterspots would be nice through a filter
 
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