I'd also be interested in what failed.
I've seen wear which they will tick. Some ppl which reboot cars will swap LH and RH side axles in holes to put pressure on the other side of the race.
I've seen the cage crack.
It's messy job- but basically cut the band/boot off(gloves a must), rage/towel off as much grease as you can. Then use some cleaner(not your parts washer as it will make a mess of the fluid). Then look closely at the balls, inner, outer races, and the retainer which is metal. There are snap ring which allow the joint to come off the axle.
Now to answer your question. Absolutely. I would clean them well, A nice coat of silicone spray on the boots(ace hardware, lowes, Napa etc). But that's after it's washed.
I would then clean up the rust, lightly with a scotch brite including the paint still there- finish with primer & paint(between the joints). On the outboard, I just cleaned it up and then put a thinest spraying of paint. Clean the splines- wire brush. Look for burs and remove them with a file/stone. Light coat of grease to aid assy.
Michael