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Are they hard to keep clean???
Well, not really. You just have to be prepared to do it once in a while. The best The best way I've found so far is to use two kinds of degreasers. First one strong to clean the tire, then a "greener" microdegreaser to get rid of the first one. Did that make sence? 
"Wise men speak because they have something to say, fools because they have to say something."
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