If you're looking to buy a used coin-operated washer and dryer, chances are you've done some research online. You might have noticed that the ads seem to be everywhere online and they are often placed in the same spot as the other ads that advertise other things that they want to sell: cars, electronics, etc. If you're interested in buying a used coin-operated washer and dryer for your home, there are some important steps you need to take before you go into the store to purchase o…