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What about those tunnel washes that don't use brushes?
In the sub-freezing weather, I had to get the salt off of my car, so I took it to one of those tunnels that uses strips of felt hanging instead of brushes. I watched the car through the entire process and the contact between the soap, water, sponge with the car was comparable to what it receives when I wash it.
Even the wheel washers were felt pads instead of brushes.
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