I was dissasembling a Sony VAIO VPCF1 to take a look at a faulty keyboard when I noticed a strange white substance underneath it. Upon looking at another dissasembly guide, I didn't notice anything similar in the same spot. I was wondering if that should be there or it's some sort of liquid spill from the person I'm fixing this for. It kind of looks like dried up thermal compound, but I'm not sure. When replacing the keyboard, should I clean it off? Take a look at the pictures and let me know if you have an idea!