I assume this is a tweeter speaker. As you can see something stained the plastic. Wax or whatever. It doesn't seem to come off with anything. Anyone know what this piece is actually called and how easy is it to replace.

 

Its called an inner tweeter cover and its a friction fit on the door sail assembly. It appears that your car is a sedan and mine is a coup but for WIW, my cover just pulled straight off.

Heres a link to another forum that shows what you have in store to replace it. If it were me, Id upgrade both tweeters while I was in there

DIY Tweeter Install 06 g35 Coupe : G35 and G37 Interior, Exterior and Audio

 

Well if I can just get the cover off an replace it that's what ill do. The speaker is fine this is just cosmetics we're talking about here. Thanks for the help

 

Do you have to pull off the entire door panel to pull the tweeter sail panel off?