Scent Killers/Scent Eliminators/Scent Covers. Do they work?

Entry/Exit was my only concern also. I've tried many different brands and can say that they are NOT all the same. One season I bought a gallon of Scent Shield and deer were hitting my scent trail and turning right around, it was a nightmare! I wonder how many deer that crap costed me and I didn't even know it.
The best I have found has been Tinks for covering my tracks.