Cleaning the intake manifold.

[evilunclegrimace]

There are alot of aluminum safe products on the market if you do a little research. Formula 88 comes to mind as well as Zep 505.

 

[62barsoom]

Simple Green is very corrosive, especially if you don't get it all washed off. If you have a polished aluminum surface it will instantly dull it.

A different formulation.

Simple Green Industrial Cleaning Site

Simple Green | US | Industrial | Products | Extreme Aircraft Precision CleanerLearn about Simple Green's full line of environmentally safer household cleaning products. Discounts, cleaning tips, reviews, special offers and more.

simplegreen.com

 

[Motrhedx81]

I've been using mineral spirits to break up the initial oil/grease build up. Then clean with simple green. Finish off with brake cleaner. Perfect, no, but it's worked with all the nasty stiff I had.

 

[62barsoom]

This red orange crap is a bear to get off. I also found it in the left valve cover and fill spout. I'm guessing evidence of the gasket leaking.

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[skylark]

This red orange crap is a bear to get off. I also found it in the left valve cover and fill spout. I'm guessing evidence of the gasket leaking.

You must be registered for see images attach

If I had to guess, I'd say that had previously been Dex-kill.