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2020 GLC 300 4Matic, '19 GLS; '05 C240 Wagon, '04 G280 from Italy
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Greetings, is there an additive that is trusted that can be added to the water and soap? I know the Benz dealer says they’re detail shop leaves no spots but wouldn’t share the product.
By the way, what’s the best soap to use? I have a new car 😊
Thanks.
 

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In order to have water that doesn't leave spots you need to remove the contaminants that cause the spots, not add stuff.

The dealer's secret is an RO filter or similar.
 
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