A coil usually doesn't go bad so quickly. You get some erratic operation first, like poor firing at high rpm. Unbolt the coil and make sure the frame is clean and free of paint at the attaching point. It needs a good ground.
If you are talking about cleaning the stock Leonelli switch, it has several functions all jammed together in the small housing. It is most likely you disturbed the contact shoe for the kill button and it's shorting the ignition constantly. You should be able to unhook all the connectors from the multi-function switch, then test for spark by kicking the engine over.
One other thing after testing the rest, is to unscrew the spark plug cap from the wire, cut the wire back a 1/4", then screw it back on. This would provide a good connection if the original connection was iffy.
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2011 EC250E
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