It doesn't offer much lubrication between mitt and paint either. Just an FYI... you might consider a quality car wash to add lubrication to help to prevent washing-induced swirls/scratches.

 

For the car wash soap, ask the owner what they use, as most of is diluted down. Most of the brushes do not hold mud or dirt, if you are unsure ask to see and walk in the tunnel. I wash mine in a tunnel 2 or 3 times a week and no problems.