Originally posted by Megafast13
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Sadly, it is the source of water that is the problem - not the soap.
There are a few ways to minimize the issues, including getting up early or doing the wash around dusk when the sun is at its weakest. It also helps to start with a cool surface.
Next thing you can do is to wash only one panel at a time, and then rinse that panel AND quickly wet the rest of the car after each panel. I find even without direct sun some water sources will spot (especially on dark glass or paint) in literally under 30 seconds.
The only way to combat that is to very thoroughly keep rinsing it and keep the surface cool as you work.
I also find that Meguiar's Last Touch detailer spray (Can be bought by the gallon and diluted, very inexpensive product) helps during drying to reduce swirling AND water spots. It will even remove fresh water spots with a gentle mist and wipe.
The other option all together is to use a rinse-less wash method and do the entire wash inside the garage, one panel at a time and dry as you go. But Meguiar's does not currently offer a product that is approved for that method.
I personally find Last Touch to work well for that method as well, but that is a road you may not want to venture down quite yet.
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