I am still experimenting with mock scrapes...though I have killed two bucks standing in my scrape in the last five years...
I tend to use a dropper bag (HS Scents, I believe) with their mix of deer scents...there are probably better combinations though...
During late October through rifle season, I always drag a "rag" loaded with DOE-IN-HEAT (Tinks 69) right through the mock scrape and any other real ones...tie the "rag" about 4 feet up in a tree within easy shooting distance...