I thought Kitchens were for exhaust cleaning. I took both of my cars exhaust trims off (eventually!) and washed them, then used Auto Glym Intensive Tar remover (wonderful stuff), Then a light bit of cutting compound to remove stubborn stains and finally Anusol sorry Autosol to polish them...
I have been to see a C32 today but am a bit dubious...it seems to drive well under 'normal' conditions, but when kicked down hard it loses drive - just free-wheels. If you stop, it will simply drive again as if nothing had happened. I am concerned that this might be a nasty fault, but suspect...