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They're right about the Optispark. I found that out the hard way. About $800 for the tow and new optispark install.
I use Simple Green and a spray bottle of water and stay away from the Optispark. It takes some time the first time if the engine is really dirty. After that the ongoing touch-up is very easy.
I don't cover anything, spray it down with degreaser and hose the crap out of it. If it misses when I start it due to water in the opti I let it sit for a while and it's ok. My driveway has an incline and that might be why I haven't had a problem but, I have never had a problem washing the engine.