I waite for the bucks to start scraping on their own. Then I find the biggest and baddest scrape and put a dripper over it as well as a licking branch above the scrape.
Always wear rubber boots and rubber gloves when tending this scrape. I use a drag line and walk over the scrape and almost to my stand. Take off the drag line and hang it on a tree to pick up on your way out.
The Bucks will tell you when to start hunting scrapes!!!
Good Luck!