Coleman's isn't that bad, but I notice that unlike whatever used to be in Chinese green gas, the olfactory additive (Ethanethiol -- the smelliest stuff on Earth, according to Guinness World Records) seems to really cling to stuff it came into contact with: my GBBs chambers now have a permanent propane odor to them, as do the insides of my mags and valves.
MadMax should come up with some scented silicone oil (no, not th sexy kind).
And I still have a can of oldschool Green I used for home shooting. My living space is too small to have it stinking of propane.
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