polo EGR valve - scfc_151
I noticed a loud 'rumbling' on a 1.9 d polo. After checking the obvious (exhust mounts, idle speed etc) ive been told it might be a clogged with soot up exhaust gas re-circulation valve. Has anyone had any dealings with this.

Where is this valve located and is it easily cleaned. Is it worth trying to clean the valve out?

thanks