For the past 15  years I have been fighting an expensive and losing battle with squirrels.  They have outmaneuvered all my expensive bird feeders.  One of the salesmen at my hardware store recommended Cole’s Hot Meats.  Having tried pepper before, I was not hopeful but finally tried it a week ago.  Since then the squirrels have avoided the feeder as well as the food dropped under it; the birds are loving it and I’m unable to count all the warblers, gold finches, chickadees, titmice, etc. who are frequenting the feeder.  I have recommended it to my friends on FB- you should be having an increase in business!!