When is an automatic car wash the cleanest?

When is an automatic car wash the cleanest? Is there any maintenance to the fabric rollers, curtains and brushes to remove accumulated dirt?

I don't know anything about car washes but I presume there would be some type of self care cycle or does this happen after or during every wash?

We have some winter weather here and our vehicles are heavily covered in road grime and salt. I can imagine car wash equipment being extra dirty from the increased dirty on everyone's vehicles and I don't...

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