Sticky in Chennai

There is a cycle his feet go through on a daily basis.  In the morning, he showers, he is clean.  He walks a bit barefoot, then puts on his socks, shoes and goes to work.  When he returns, he removes his shoes and socks and walks around with bare feet.  By bedtime, his feet are quite filthy and I have stopped asking him to wash his feet before coming to bed.  Needless to say I have adjusted to varying degrees of filth.  I had attempted to make him wear slippers around the apartment but obviously I failed. The fact that the floor is mopped every day seems to make some difference I suppose. His feet would be blacker were it not for daily cleaning.  Above are his feet after an evening plus a morning of bare foot walking.  On a Sunday with nowhere to go, the shower came late, creating filthy feet I did not dream possible.