RE: Scrape Drippers
The best success I have had with drippers is to start them in August and keep them running for a few months. I have shot deer next to a dripper but have never seen a buck work the scrape, though I know it was being worked by does and bucks.
I don' t use them anymore because I have ruined a few good spots with them also. Very hard to keep it full and check it without leaving some sort of scent. And if the scent you use is not good things go south quick.