I’m going replace the valve cover gaskets on one of my cars. The job is easy enough and only requires removing about 10 parts overall. The issue I don’t know how to resolve is how to clean the valve cover itself. It has about 180 thousand miles worth of blow by and oily gloop on it.
Any suggestions on what to use to clean the stuff off the valve cover and then how do I dispose of the liquid(s) used for cleaning?

~Thanks~

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Toyota is a leader only because their drivers block everyone behind them. Oh what a feeling.