I wouldn't worry about the oil yet. As others have mentioned cover up shafts boots etc. I usually take like a suran wrap and wrap the shafts followed by rags and tape. Do the best you can and don't spray those areas directly. Depending how dirty they are you can let them soak with simple green.. might help loosen some of it up. You will get best results with a hot pressure water vs cold. Blow dry with air.
When you're done cleaning unwrap everything and see. If there's water then you can do a few things. I'd drain then drain the oil if you were planning on changing it. If not, something like wd40, kroil, etc will get rid of water. You can spray them directly on bearings and shaft openings which will repel water and lubricate to keep out rust. If u get a lot of water in either you can drain them and fill up the case partly with something like I mentioned above and awash it around in there and drain that out.
If you prep it good you should be just fine
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