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I haven't read the entire thread but wanted to point out that, at least on the speed6, wet plugs are very, very, very rarely the cause of trouble.
Note the top mount intercooler, with the ducting pulling air in from the front grill. Now think about driving in the rain, and how much water is getting in, through the ducting, through the TMIC and into that channel where the plugs go.
Heck, note particularly the drain holes in that cavity for that very reason.
Bad coil packs happen, not a big deal. But from washing the engine I'd be more worried about the alternator & such than the plugs & coil packs.
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