Wrap anything electrical with plastic. Saran type wrap works, then tape it shut so that water doesn't get into it. That includes your MSD and your coils. Don't take it to a car wash with the wand, because you can't control where the overspray goes. Use a stiff brush like a carburetor cleaning round brush and use a solution of "Dawn" brand dish soap and water. If you have some oil leak around your valve covers and oil pan, you may have to use a wire brush, but be careful not to knock off any paint. Yours doesn't look all that dirty, so maybe just an old rag with the soap solution will work. Then just rinse it off with the garden hose, being careful to stay away from the electrical components. Don't use a sprayer, and don't put your thumb over the end of the hose. If the first try doesn't get it as clean as you want, then hit it again.
