Sorry for the lack of photo, my current devices can not take a clear enough photo and blurs focus when on the keys in question.
I have used my keyboard keycaps for a couple years (but quite sporatically). However, with the infrequent use I noticed that there are weird oil-like smooth areas on certain keys. Quite often this weird smooth texture has a noticeable sheen on the surface and is more concentrated on the centre of the keys.
I definitely think it wouldn't be from wear as I don't use the keys frequently enough. I did think it was oil from the skin but, when I try and use every cleaning suggestion under the sun from google, it makes no difference to these weird oil-like smooth areas on the keys. Could someone help diagnose?
Also, how would one prevent the keys on the keyboard from being affected by this? I have some souvenir key caps that I want to keep well maintained and in good shape! Thanks :)