I used a not too wet towel without any soap or such. I'm being very gentle with the material, cause it really sucks. Also I was reading back upon some emails I had before with nike helpdesk concerning the material used. And they told me this in their emails.
"For this type of shoe, some of the...
My first ID's came in today, one more to come. I was planning to do more pairs after these, but not sure after receiving my first, it all looks great to have custom colours, but the felt material looks too felthy for, and it will get dirty real easy, making the shoe unwearable without messing it...