I use a degreaser, a mit, and a tooth brush to clean them. I wash them regularly--about every 200 miles or monthly. I bought the wheels about 8 months ago on eBay and they were repainted off the car without the tires and stems (the proper way) prior to purchase. The little bits of paint overlap that appears is actually paint build up around the opening and not on the stem itself. It erks me when I see that on repainted wheels. I plan to change the valve caps to the smaller OEM MB brushed metal ones.
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