Fact-check me on sandblasting, would you?

For degreasing, try Easy-Off oven cleaner. I like the pump bottle stuff, as it's easier to direct the flow where I want it. The aerosol version tends to be real powerful and splashes all over, including on me. I leave it on for about 10 minutes then rinse and repeat as needed. It works very well and seldom needs more than one extra application.

I agree with the others, for stuff going in the blaster it needs to be degreased before getting blasted. Outdoors with no recovery, it wouldn't make any difference.