Automatic car washes and side intakes?

[MWS]

Over my years of ownership I have usually tried to hand wash, but I'll admit once and a while I have done an automatic car wash. I've been reluctant to do so primarily because of the side intakes and didn't want water where it shouldn't be.

I've been thinking about making a set of "plugs" out of 2" styrofoam to cover the side intakes during a car wash, but was wondering if this is really needed, or if I am just looking to for something to do. I am aware of the other issues with automatic car washes and why not to use them (recycled water, detergents, etc.), but would just like advice on the side intakes in relationship to automatic washes.

Thanks in advance.