The best reaction ive had with scrapes is to transfer licking branches and dirt.
Find a community scrape in late September on two different farms say 2-5 miles away. Wear rubber gloves, clean shovel, clean bucket.
Snip the licking branch, dig up the dirt in the scrape.
Drive to different farm and clip licking branch, dig up the dirt. Zip tie licking branch from first farm and dump new dirt, drive back and repeat at original location.
Bucks/ does will all investigate and work the scrape
The second best reaction I've gotten is simply just to pee in them, it works and is alot easier than moving branches and dirt. It works way better than any dripper ive tried.
I will say that according to my cameras, most scrapes are used during the dark up until the later parts of the rut when bucks are really searching for that last doe