I have a random smudge of grease on the inside of the plastic "glass" over my instrument panel. Is it relatively easy to get back there to clean or would it be major surgery? I don't care enough about it to remove half the dash to get to it, but if its a matter of popping open the plastic above the IP then I'd be willing to give it a shot.

 

you'll have to remove the instrument cluster first... there is a DIY video on that. After that, removing the lens should be pretty straight forward.

 

and how would that smudge of grease get on the inside??