Hi, antichew sprays don't work, mostly because you can't spray everything. If you need to leave the dog alone, get a large dog crate and put his bed in there. You will know then that why you are out, he is safe and so is your house. It isn't cruel, as my dogs often choose to go in during the day for a snooze. It also helps to put him in there when you have visitors or children etc as they can get a bit of peace.
Give him plenty of things that he can chew, not a lot of bones as they can splinter and can give the runs, also watch hide chews as they can choke a dog, give nylabone chews or similar, they are great.
Good luck.