My solution is tried and tested....the best way to stop a squirrel from chewing a hole in your trash can is to first confront the squirrel....this can be done by pulling it's tale very hard and tapping it on the nose.
Then in no-uncertain terms..you need to tell the squirrel that if it continues to chew on your trash can you will be forced to put out an empty trash can with a live trap in it and catch it and then perform the water worthiness test!
This intervention method also works well for squirrels that have a drink or drug problem. The trick is getting it right...pulling the tail first then tapping the nose...vs. tapping the tale and pulling the nose....which generally causes the squirrel to get very angry!
Good luck!
Source(s):
My Brother's Almanac 2001.