I don't. At least 99% of the time I don't. I figure all the soapy water running over my feet in the shower should do the job. I usually stop washing half way down my calf. Maybe I'm too lazy to bend down and actually wash my feet. I don't know. It never occurred to me to wash them. I usually only wash my feet after going hiking because my feet get visibly dirty. I wear flip flops basically year round and my feet don't smell.