Hi, j never cleaned the exausts at the end , j discussed with Steve (G.B.)
may be the mixing air gasoline is too rich or european gasoline is different as the end of exausts were very dirty (4.500 km) he told me to use industrial soap.
J wish to inform the board j used " SU890 from Johnson Diversey ex Unilever" pure. the exaust ends were cleaned and shining in a couple of minutes
ciao
Hannibal