[Perfectlap]

I bent a wheel once on one of those tracks. Cost $75 to straighten and repaint.
The shop had about 50 wheels waiting to be done in the garage. The high pressure(not too high) is only good if you can manually direct it yourself, making sure to stay away from the window edges and the back window. Its really important to dislodge all the debris in the top and a stiff stream of water is the least abrasive method. Traped dirt is what breaks down the fabric and causes tears. That's why a protectant is so important.
If you must go to the auto car wash tell them to use your microfiber drying towel and give them a Brand new chenille wash mit($4) and no soap on the canvas top.
That will eliminate most of the possible scratching. Car washes use low grade drying towels(usually dirty) and the wash mits have exceeded their shelf life.