I always ues Dawn dishwashing liquid. I use a sprayer to reach inside the shroud. I have the engine running to let the fan help spread it. Then turn the fan on hi speed for more help. Then let it sit a few minutes. Then rinse lightly thru the fan. Then flush as much as possible from the outside. You will not believe what the ground will look like when finished.
Also, have a camera ready, if you remember the I Love Lucy show with the dishwasher........
Be careful reaching inside and careful with the fins one the outside!
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