Valve cover cleaners

sandpaper

hurc ast

If you're just talking grease and oil, I use mineral spirits in a spray bottle for the aluminum parts on my motorcycle. There are some aluminum cleaners out there, but be careful with them. If stray drops get on plastic or rubber, you may end up with a lot of spotty parts.

if you want to get fairly aggressive a bead blaster using something mild like glass beads or some synthetic plastic, corn cob, or walnut shell will work. your local engine rebuilder can probably hook you up for an hours labor or something else harbor freight has cabinets under 100 bucks. saw one in a kragen ad (you may not have kragen where you are) for under 40 bucks. just know it takes an air compressor to drive it and if you get one make sure window covers are available else your vision will be blurred pretty quick. glas beads arent cheap either but last quite awhile. i have a bench top blast cabintet filled with glass beads that works really well. if you use sand that will actually grain the surface pretty bad, beads wont.

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1965 Ford Mustang fastback 2+2 A Code 289 C4 Trac-Lok Vintage Burgundy w/Black Standard Interior Vintage 40 Wheels 16X8" w/BF Goodrich Comp T/A Radial 225/50ZR16