No matter how rough something is, it can always be polished smooth with the touch of enough hands. It never ceases to amaze me how the hardest surfaces can be worn down by something as soft as the human hand, if it is touched often enough.. This rusty rail is an extreme example, but I see it all the time where I work..

Galvanized handrails worn to an incredible slick-as-glass surface where hands rub them day after day.. Steel structures and concrete slabs worn away by dripping drops of water.. Almost any wall or obstacle can be overcome by applying a little pressure, and a lot of patience...