Color on edges of buttons e25

So had this Syntakt for a month. There is a fingerprint in the middle and this morning was rubbing the area with a brand new just out of the package microfiber cloth. It was a bit dark in the room but I thought I had cleaned off the fingerprint.

I get home tonight and my kid tells me there is some light brown discoloration on the buttons. So I look and omg, how could the microfiber cloth discolor those buttons. Has anyone seen anything like this and know how I can clean them?

II wouldnt try anything more aggressive than soap and water or the white coating might melt off and permenently ruin the button cap.

perhaps you can order a set of spare buttons via elektron support

I just did that recently for my non-e25 DT and OTmk2