No, I don't think that's what Dr Coffee meant. When you remove a bearing from the axle, you can't protect it from the huge side load you're applying to it to drive the axle shaft out so the bearing shouldn't be reused. When putting a new bearing onto the axle, the bearing can be protected because as the axle is being driven in on one side, the outer retainer is supporting the inner race on the opposing side so the bearing isn't incurring any load.

All you have to do is what people have suggested. Get yourself a little pick tool or small screwdriver and lift up the bearing cover. From there, use a rag and wipe up grease and gear oil out of the bearing. Next, do several rounds of spraying brake cleaner in the bearing to clean it out further. I would rest the axle end that goes into the 3rd member onto a block of wood on the ground and spray up into the bearing letting gravity help me get the old grease and gear oil out. Once you're satisfied the bearing is pretty clean, repack it with a good high temp wheel bearing grease. Push grease into the bearing, turn the the axle shaft back in forth to work the grease into bearing and repeat until the bearing looks to be full of grease. Push the bearing cover back on and you'll be golden Pony Boy.

But, like I suggested above, you're rolling the dice by not replacing the bearings and might find you're going back in to do this job all over again sooner than you would have hoped.