yes it is safe as long as you dampen the entire towel it works great the sweet potato comes out somewhat soft and not at all dried out ive done this a million times, then open spread with margarine and pepper, or margarine and cinnamon try it!
I just wash the skin and cut it up and boil it — it cooks pretty fast, within a few minutes. I remove the skin if I’m feeding it to a baby or small toddler, though, since babies don’t do well with skins.