It's worth noting that the manual states that you should use "special convertible top cleaning agent" on the roof, and that after every three to five washes you should treat that top with "impregnating agent". Looks like it's available from BMW's online shop.
Not sure if I'm going to use the official BMW stuff on the roof or spring for something a bit more high-tech like Gtechniq's I1 Smart Fabric. Anyone got any thoughts?
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