You don't "need" to clay, but it would be good to know that you are putting the Werkstatt down on a perfectly clean/smooth surface base.When you're going to spend the time washing and protecting another hour or two claying isn't much. As noted already use a mild clay, very much doubt anything aggressive would be needed. Plenty of lube for the clay too. One other point I always pass on to folk, don't do it outside on a winding dusty day!
I clayed a brand new 1series (okay had done 150miles!) couple months back and even that surprised me as to what came off, particularly the lowers by the wheel arches.
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