A garbage disposal is a wonderful kitchen appliance until such time as it starts to smell. The odor can be very hard to remove if you try many of the remedies I have seen in books and on the Internet. If you have a smelly garbage waste disposal, I know a way that really works to get it clean. Once it is clean, it is easy to keep it odor-free for years.
Hot water heaters can have short lives. Hot water heater problems include corrosion from moisture and oxygen damages the tank and fittings of the heater. Plumbers can add a backflow device to help.