During my time spent as a Seventh Day Adventist Elder, the practice of foot washing was often done. Now, we used cold water for this ritual. It has come to my attention of late that hot water is more efficient for cleansing issues. In working on my Chi, I have used the hottest water available for cleaning my personal space as well as during personal hygiene. It works very well for this.
I have taken this practice of foot washing into consideration. First trying it on myself. BTW, highly recommended for groups when gathering, for clarity. I used a cloth with as hot a water as I could stand to touch. One foot first, then the other. The sensation was almost overwhelming. Very calming and relaxing at the same time. So, I tried it on my 5yo grandson. He loves foot massages so he was willing. Well, he nearly melted into a puddle right before my eyes.
So, foot washing yay or nay? My thoughts are give it a try. You may be surprised by the results. Heat cures!