Aslong as Electrics are well covered it will be fine asuming the engine is left running.
I did this to mine awhile ago and a small amount of water got past the HT lead, causing the sparkplug to arch out - Thing is it only started arching 4 days after i cleaned it.
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Personally a trip to AutoSafe
soon sorted it all out. The symptons once it was arching was a popping exhaust, severe lack of power and generally didnt run right
DNA by The KFC (Off Rockferry by-pass) do engine steamcleans