How do I know if Rear is still good?

Andre68 said

So when I pull the rear end out, I do want to clean it and paint it.

If I were to spray it with easy off and pressure wash it, would that be fine? Or can it cause some internal damage, with seals and stuff

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Pressure washing should be no issue, just cover up the vent hole if it has one.
Then take it apart and inspect everything, assume that it will need brakes, wheel cylinders, brake lines and a hardware kit at the very minimum.
Is it a 7.25 or 8.75 rear?