You did spell them right, Chris...

Tony,


The brake cleaning solvent Chris suggested would work.
However, the goo on your engine is also soluble in methanol, since before it was deposited on your engine's parts, it was a lubricant in glow fuel...

Just using methanol is safer for the carburettor's O-ring, should it come in contact with it.
If this O-ring is silicone, I am not so sure the break cleaner would be that harmless...


...As to acetone, it can be added in low percentages (2-5%) to glow fuel, to reduce the chance of detonation, in very high compression engines...