Well actually i did try what ostensibly appeared to be one of the madder AB answers to this question... this is not a wind up. It was suggasted to place a banana skin or rub one on the affected area. As i have zero patience I have to admit ( I am gonna get some stick now! ) that when I sat down to watch a couple of hours of a documentary I did so with a banaa skin on the bit of hard skin , held in place with a bit of cling film and a sock. Surprisingly it worked. lol. Sloughed the skin of the next day ... result.