I bit there bullet and invested in a water filter . purchase a DI vessel and DI resin , Amazing , no water spots ( no TDI ) washed car in full sun, rinsed off through filter, with a blower dry , and walk away !! Paint looks amazing . Go for it !!
One of the best buys, I received a 10% from vyair.com today if anyone is looking to buy this bank hol code: BANKHOLIDAY10