RE: salt block's??
Put it on a top a stump. As it rains and rots hey will lick under the stump and smooth it cleaner than sandpaper. As the stump rots over the years they will chew the wood as well. Keepo the salt in the same spot, I always try and get it near bedding areas. Plain old white salt block. In PA we have to pullthem out of the woods 30 ndays prior to deer seasons , in OHio you can leave them.