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I use my shop vac with a soft brissle dusting brush on it to clean the grit and dust that is accessible then I take my air compressor hose with a jet tip on it and blow all the areas the vac doesn't get. I then go back over with the vac to pick up any debris brought out by the air hose. It you have fluids getting out that should be addressed immediately. Thankfully I don't, but my '02 has only 8500 miles. I am not one who sprays water under my hood. I may take a damp rag under there but certainly not a water hose.