is it normal on my 2010 G37 Sedan to have felt material under the rear wheel arches?
I just noticed this today.. can someone confirm this

 

Are you talking about the black-ish lining right above the tires?

 

yeah, normal

 

Yeah its a felt material used to quiet road noise

 

need more of it. g37 is pretty noisy.

 

To clean it, use a good wheel and tire cleaner like Eagle One A2Z, spray the liner liberally at the same time you clean the wheels, and let it dwell for a few minutes. Hose it off with a strong stream of water. This seems sufficient to keep them pretty clean.

I do the same for the plastic wheel liners up front.

The cabin noise in the G is due to the need for additional sound deadening material in the doors, combined with loud tires.