you can get this engine degreaser at Canadian tire, you warm the engine up , spray it on , let it sit , then wash it off, it works great for the most part, a pressure washer works well at that point , but be sur eto cover up the important bits.
You want to do what street luge said, but make sure you cover up the major electrical components first. I usually use plastic grocery bags. Double them up, cover the battery, alternator, distributor and tie them off (or use rubber bands). Rinse the engine bay, spray on the degreaser/cleaner, let sit for a bit (follow instructions on the can), then rinse off, and let dry for a while. You can them remove the bags and just throw them away.
While this will not get all the dirt and grime out from every crevice, it definitely makes a difference. Good luck,
I've found that this brush helps a ton for getting everything really clean. It also works great for more open wheels when you want to clean everything. It was originally designed for motorcycles and every detailer I know (my self included, well, back in HS anyway) loves this thing.
If you apply soap and use a brush, you won't need a pressure washer and you don't need to cover anything up. Everything under the hood is designed to be splashproof, and honda electrical connectors generally have o-rings to keep the water out. Just rinse it all out gently with a hose. I've been doing this for years with no problems. If your crx has trouble in damp or rainy weather you may not want to do it this way though.
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