For the things that you do not have a use for, but you are not sure if they have any value, set them aside and haul them to an auction or sale barn.
Most auctioneers have an eye for what will sell. They will separate out the valuable items and sell them individually to get the best price. The junk will be combined into increasingly larger lots until it sells for $1 or scrap price, the auctioneer knows which is higher. You have to take home the stuff that doesn't get a bid,so ask the autioneer if there is anything you shouldn't bother unloading.
You won't get top dollar, and be prepared for 30 percent commissions, but it is "disposed of" and you have extra money in your pocket compared to scrapping it.