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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.
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
Intercooler
