rather strange that i ask, but let me explain. i started getting wierd little grey marks on my palm rest, on the right hand side, and didn't have a clue what they were. they look like ''splodges", kinda dark on the outside and lighter on the inside. i then noticed these on the top case aswell. i also noticed my girlfriend has a few aswell on her topcase and palmrest, although not as bad. i've tried figuring out what it could be, and one crazy idea what oust. i use it in my room every now and again, and often make sure my screens closed but sometimes forget. i thought maybe the liquid has fallen on my laptop on made the marks. anyone else with this problem? or use oust with no problem? any help would be great, thanks edit: this is a white macbook, btw.