Keep lots of the cheapest, most disgusting cigars you can find handy also. Smoke them after leaving the area of decomposition smell. It will kill the smell until you can shower / change clothes.

After working a decomp scene:

Pre-soak your clothing in Coke (not Pepsi, doesn't work except with coke), and add 2 ltrs. to each load of wash.

It isn't perfect, but it seems to help.

Just don't get the black juice from decomp on you if you can. If it does get on your clothes / shoes you might as well trash them. Either the smell never goes away, or I cannot mentally get the smell to go away.

If a fire was involved, all bets are off.........