The effectiveness of supaguard depends very much on how it is applied.
Given that applying 2 coats of Auto Glymm 'extra gloss protection' has a very similar effect and is a very good paint sealant; I wouldn't bother paying BMW for their supaguard treatment.
I've always waxed and sealed the paintwork on my BMW and never had issues with bird muck. It's just simply wipes off with a wet rag if the paintwork is waxed and sealed properly. A job which most people can do themselves.
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