If you ever figure it out, please share. I have 4 red apple and 3 green apple trees. I do nothing but prune them, which this past year is probably the second time in their life. They are quite mature, probably as old as yours. The apple are UGLY but I suppose they don't have to be pretty for applesauce. The red one is a combination of sweet and sour, but may not have been entirely ripe yet.
Who was it that talked about nursing some old neglected peach trees back to health? Would you share your secret? Ours basically need to be replaced, I think. The squirrels beat us to it all this year.
If the outside is not clean but the inside is just peel them. Got me some free pears one year. Peeled them and made a nice jam. You can of course cook up your apples for juice and make jelly. If no time freeze the juice measured to the recipe.