My A S and C keys letters are totally warn out and white and the light shines through a good part. I get a new laptop each year (pass old down through business)

My A S and C keys letters are totally warn out and white and the light shines through a good part. I get a new laptop each year (pass old down through business) and this degradation happens pretty quick. must be oil from fingers. though I like to think I'm pretty clean and my laptop is too..