A variety of completely different solvent chemistry types seems to be very helpful for premium cleaners. I've read guys say this several times in different places. Occassionally I myself have found that one kind of solvent does absolutely nothing and yet a different solvent readily pulls up the spot. I look forward to having insane heat too, for the spots that don't otherwise budge.
Googone.
I use the bottle with the small pee hole so its easier to put it all in one small spot. Use the cap to aggitate it. Rinse well.
Its the only spotter I use anymore besides 40 volume on stains.