Cleaning the undercarriage...

I take it through the touchless car wash once a week or so in the winter time (never a regular drive-thru car wash...gives too many swirls and scratches) and choose the option with the undercarriage wash. That's only in the winter, though. Otherwise, everything is done by hand!
 
Laser touchless car wash for me. Maybe a few times during the winter. Definitely after the last storm. I don't have a pressure washer and my car is low to the ground.
 
I guess I'm a minority. Having driven on salted winter roads for the last 30 years, I don't bother with the undercarriage after trying every anti-corrosion methodology under the sun. Nothing works against the salt, in the long run, short of not driving the car. Our daily drivers are essentially appliances. We follow a religious mechanical maintenance schedule, and drive the said appliances until they completely wear out. The cars that matter don't see salt. Ever.
 
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