Hello, I had my MBP since 2010 and everything worked fine. In recent days there has been very hot indoors, so my hand-palms have been quite wet & sweaty and this has contributed to a discoloration on my aluminum.
Why did this happen? A few days ago, you could see no trace at all of this. It has been super, but something must have happened...
How can I fix it?

Why did this happen? A few days ago, you could see no trace at all of this. It has been super, but something must have happened...
How can I fix it?