This Old House plumbing and heating expert Richard Trethewey comes up smelling sweet by installing a new discharge hose. (See below for a shopping list and tools.)
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Shopping List for Replacing a Smelly Dishwasher Drain Hose:
discharge hose
duct tape
metal pipe clamps

Tools for Replacing a Smelly Dishwasher Drain Hose:
pliers
shallow baking dish, used to collect water drained from hose
nut driver
drill/driver

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How to Replace a Smelly Dishwasher Drain Hose | This Old House
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