Here’s a comic from April 23, 1948. It comes from “All in a Lifetime” by Beck. This strip, looking at “olden” times, has done quite a few barefoot comics. This is the sixth one of them I’ve shown.
All In A Lifetime, April 23, 1948
Pretty obviously, dirty feet have been an issue with mothers for a long time.
Ahcuah 
My feet actually do get dirty from walking around inside the house. But then we don’t have a housekeeper.