Glossary / General

deionized water

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Too Afraid to Ask

Deionized water is very clean water that doesn't have minerals in it. This is good for washing cars because it helps prevent spots from forming on the paint.

Technical Definition

Deionized water is water that has had its mineral ions removed, making it purer and less likely to leave spots on surfaces when used for washing cars. It's often used in detailing to avoid water spots on paint.

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"It's after you've rinsed the soap off that you could potentially run into water spots if you don't have something like deionized water."

How To Wash, Clay & Protect Your Car In Direct Sun The Auto Detailing Podcast 07:16

"Hey, Matt, do you fill wash buckets with deionized water washing cars? No, I don't."

Dialed In Podcast: February 27th, 2026 Dialed In - Some Obsession Required 39:48

"So I unscrewed that and I got some deionized water. And I thought, I'll just give it a little bit of a drink."

A Corny Cliffhanger The Tyre Kickers - Classic Cars 16:26

Cars Known For This

Honda S2000 BMW X5 BMW 3 Series

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