Sandblasting Vs. Steam cleaning

I have a tractor that has been stripped down to the engine, transmission, and rear axles. I need to clean it but I don't know which way to go. I have a small sand blaster (1/2" ID hose) but I can't rent an air compressor big enough to run it. I was also exploring the option of renting a steam pressure washer and steam cleaning all the old paint and grease off.

If I sand blasted it, i'd have to carry the chassis to someone and have them do it by means of loading/unloading with a forklift which kinda scares me. I'm also worried about sand getting in the engine and transmission. I can't rent a true steam cleaner, but the guy says he'll rent me a high pressure washer that may or may not remove the paint so it sounds skeptical at best.

Should I spray the whole thing down with oven cleaner and try my luck with the pressure washer (even though I have new gaskets all over the place) or do I run the risk of sandblasting and do it myself being extrememly careful? What say ye?

Jeb