I wouldn't use an automated car wash much below 30 degrees F (-1 C)
Some won't even be open if it is in the 20's.

They are somewhat effective, but be aware that a heavy salt
encrustation may take multiple washes to remove the stuff, and even
then you'll likely miss some. They are better than letting it rust
your vehicle.

On Jan 28, 2007, at 5:53 AM, Max Wellhouse wrote:

> Anyone have experience with these Northern automatic car washes that
> advertise"undercarriage wash" in addition to the other whistles and
> bells offered?  Are they effective in getting the salt out of the
> wheel wells and other areas?  Will the water tend to freeze up brake
> cables etc or do the air blasts dished out at the end sufficient to
> dry that stuff?  What is the lowest temp you'd recommend having
> this done?