Hi


When you rinse off do you use just a open ended hose?
Works best.
I always spray the wet car over with a good quick detailer, like the Chemical Guys one, then dry off with two microfiber towels.
I live in a very hard water area so this is a common problem.

Hope this helps

Mike
 
well i got a 25l di resin vessel off fleebay and got to try it out on saturday, washed my black lcr in the sun, gave it a rinse with the water which passed through thte di vessel and no water marks!!