Jesus calls His disciples clean once He washes their feet. Each one has bathed, and therefore does not need to be washed again “except for his feet.” (John 13:10, ESV) Jesus says His disciples — because they are washed by Him — are clean. All they need do is wash one another’s feet, and so remain clean.
“Do you understand what I do for you? You call Me Teacher and Lord, and you are right, for so I Am. If I then, your Lord and Teacher, wash your feet, you also ought to wash one another’s feet. For I give you an example, that you also should do just as I do to you.” (John 13:12-15)
So, Jesus makes us clean. But, we need to get our feet washed every day. Feet obviously get dirty as part of moving around in the world. Jesus washes our feet; we need to wash each other’s feet. Notice Jesus is not pointing out every speck of dirt and smear of mud; rather He takes the towel He has tied around His waist and washes the feet of each disciple. He doesn’t examine the dirt He removes; He just neatly removes it.
As we go about washing one another’s feet, let’s remember the rest of the person is already clean by virtue of the sacrificial work of Jesus. Let’s just remove the dust that collects on our feet without worrying and nitpicking about whether her dirt is worse than his dirt. After all, to God, it’s all dirt!