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I'm a believer about using Windex. Check out my homepage...I show a before and after. The procedure (per Mr. Flintstone) is as follows:
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Procedure for Detailing Under the Hood
I'm sure someone will find fault with this method, but it works like a champ:
**NOTE** When I say spray down the engine compartment with the hose, I'm talking about very gentle, barely more than a spritz. The idea is to get the visible surfaces wet, not flood the electronics.
1. Start the car and let it idle for 5 minutes to warm it up and then shut it off.
2. Using a vinegar-based glass cleaner like Windex, amply spritz the beauty covers, radiator shroud, hoses, etc. The more the better.
3. Close the hood and go drink a beer.
4. Take your garden hose and wash off the glass cleaner. See note above.
5. Spray Armor-all or equiv. over those same surfaces. Avoid the belts and as many wires, etc. as you can. Use a lot on the fender covers.
6. Close the hood and wash the rest of the car. Keep the hood closed for at least 10 minutes.
When you open up the hood it will look brand new, trust me.
I got this tip from a well-known detailer who has won enough shows to make a believer out of me.
Simple Green was on sale at the local Meijer's store Saturday so I thought I would try it. I saturated an allready hot engine and while it was running I sprayed it off with a power hose, I left the car running, closed the hood and washed and dried the rest car. After about a half hour I opened the hood and it looked great.
I drove the car about two hours after cleaning the engine to make sure it was good -n- dry before I turned it off.