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acetone, shellite or isopropyl alcohol is very very good for that sort of stuff if you can get your hands on any. I find petrol tends to leave a residue.

are any of those harmful to the engine or combustion?

You gotta take all of the pipes out and core and flush em with somthing like acetone, something that doesnt have an oil content in it. Acetone will turn into vapor in like a couple of seconds so it leaves no residue and no oil.

Yeah id use shellite. Im a cleaning nut..even I wouldnt really bother doing it unless you gotta take it apart...If your engine is healthy there shouldnt be anything in there. I guess over time a little oil residue may build up. I can only really see a point in flushing the core as its the only part that will create enough resistance for residue to build up...

Edited by Godzilla32
are any of those harmful to the engine or combustion?

nope they all go bang when you put a match to them :sick:. As said above Iso or acetone/acetate are the best things leave no residue at all so no worries :(

I just read in the latest hot 4s tech handbook that you should just use degreaser and rinse well. I have just done this but haven't driven it yet. Hope this will be ok?

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