Intercooler
 

Is there anything that will remove the dirt and crap built up on the vains of my STI tmi?

Really lets the engine bay down after you have cleaned it.

i used gunk, then washed it with a hosepipe, dont use a jetwash though or a hard brush as you will bend the vains.
let the gunk soak in and brush with a soft paint brush if required.

grand mate. that the stuff from halfords?

I just used alloy wheel cleaner and rubbed it with a 2" paint brush. comes up a bit too shiney for my liking though. looks like i bought it from halfords :)

Ill give it a go.

Take it off and soak it in the bath :)

It's the bits in between the vanes that will be the PITA

yeah its the vanes that let it down.