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      01-04-2006, 10:03 AM   #3
DavidN
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Drives: 1997 BMW 318i
Join Date: Sep 2005
Location: Toronto

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If you're using carnuba wax, then yes, the car wash will remove the wax after multipe washes. This is not necessarily because of the heat of the water, but also because of the detergent used. They will both wear out the wax with time.

Sealants like klasse and zaino are much more durable and will hold up better to an automatic car wash.