I've used blue coral and tuff stuff with oxy. Both for carpets.
The odor is hard to describe. a cross between a gym sock and wet moldy leather.
If you got caught in the rain, stepped in a few muddy puddles with your leather shoes, and then let them sit out for a few days.
Took possession of a '98 528i on May 12, 2009.
Still can't take the grin off my face!