Clean felt slippers
My 2 year old felt slippers needed a retread. I have used commercially available foam cleaner for the bathroom and the slippers so that foamed inside and outside, leave for 1/2 hour and worked with a nail brush.
The pumice had to be used for outer, resistant stains. Rinse everything and let it dry near the heater.
Voilà, the result: They are like new and smell nice and fresh (which you can not always say about my feet) ;-)))