I went at my disgusting feet last night with a Newton Chiropody Sponge. OMG. There is absolutely no point to this thread other than to say it was just lovely and my trotters are like new.
I got my first pack of these sponges (they're not squishy like sponges - actually very hard and gratey) after a recommendation on a foot thread on here last year and I've never found anything as good. You can get multipacks on amazon.
(Just to make it quite clear I'm a long standing MNer with absolutely no affiliation to whoever makes these things, I just wanted to share my hard skin joy
)