I am going to have to disagree with it being an oil leak from the water pump...it appears to simply be coolant leaks from loose clamps that caused it road grime to mix with it and look like an oil leak...very common. The oil seepage around the valve covers is normal. As far as cleaning goes...use two inch wide paintbrush and gentle decreased like simple green or pinesol and as pointed out keep it away from electrical stuff. .02
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