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I live in a hard water area. When washing the car, you have to dry it real fast or you end up with terrible water spots. Has anyone used a deionising water filter system or something similar? Apparently , with deionised water you just rinse off the the soap after washing , stand back , allow the car to air dry and that's it!!
 

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VW T-cross SEL 115 DSG 2019 Energetic Orange
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Can't remember the name, but in the recent past I had a bottle of something that a couple of capfulls in the bucket stopped those white marks occurring.
 

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VW T-cross SEL 115 DSG 2019 Energetic Orange
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Just had a quick look online. Auto rinse aid is about £8.50 for 5 litres, or an in line filter for hose pipe is £55. Hope this helps. I had a ceramic coating on mine when new and so far had no problems 🤞 Hard water area here too.
 

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Those deionising filters are not that great. Just use a good rinse aid like FIreball ultimate or Autofinesse Aqua Coat, you just simply spray on the wet car then rinse it and the water just beads off the paintwork. You can then dry it with good microfiber towels. I recommend you seal the paint with a good wax or ceramic detailer. My turquoise T-Cross dries very nicely after having ceramic protection, no spots although I live in a hard water area. On the RS I have PPF and that is a real joy to clean.
 
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