You can also try a product called "Folex". I bought it at Lowe's for only $5.00 for 32 ounces. You spray it on, let it sit for 2 or 3 minutes and wipe with a paper towel. It's amazing. The stains almost disappear before your eyes.
If it is blood, you can also try hydrogen peroxide.
When I worked at the local GM we had a year old Envoy that a man had died inside (suicide) and rotted for about a week. This spilled about as many bodily fluids as you can imagine. The cure? The entire interior of the vehicle was discarded (including the dash and whatnot) and the cabin fumigated, then repainted. After installation, a new interior was installed. At a cost of only about $12K and three months off the road, the vehicle had no remaining stains or odors. If your body fluid stains are very bad, this procedure just might work for you!
Tranny fluid is generally a rich or dark red color. If it is smelling burnt, then the fluid has gotten hot. Therefore the tranny has been worked and possibly overheated. If the fluid is still somewhat red in color, maybe slightly burnt, then change it now. If it is dark brown or black, then changing it is no guarantee to fix it. Some cars that have had dark or black fluid, had the fluid changed and they never moved again.
Pop the hood. Right in front of your face will be a small, black cylindrical reservoir with a black screw cap. It is unlabeled. Open it up. Pour in power steering fluid. Pop the hood. Right in front of your face will be a small, black cylindrical reservoir with a black screw cap. It is unlabeled. Open it up. Pour in power steering fluid.