Myself and Dagnut cleaned mine with carb cleaner about a year ago,Well mostly dave done it being honest.... and mad a huge difference, I'm Replacing mine now this year with the 3mm hoses, just too see if there is a difference in the smaller diameter pipe, Should be at it next friday when back in eire, Will let ye know how i get on. Also going doing the rest of the pipes in the enginebay,
John