A sour house smell can be caused by a wide range of issues, from dirty laundry or food left in the fridge to damp rugs or moldy ductwork. Odor-masking air fresheners might help for a bit, but the best way to eliminate sour house smell is to track down and clean the source. Start with the most likely culprits, such as dirty drains and trash cans, then move on to a musty basement or garage. Finally, check the HVAC system for a clogged filter or moldy vents, which can spread sour smells throughout the house.

Eliminate sour house smell is one of the most common causes of sour smells, as damp clothing or towels can hold onto that musty scent for days if they are not fully dried. If you have a smelly washing machine, run a hot wash with two cups of vinegar to clear the buildup. Empty and scrub trash cans and garbage disposals, and wipe down cabinets and cupboards. Wash pet bedding and blankets frequently to prevent sour odors, and wash the garbage disposal with a cup of baking soda.

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Dirty kitchens are another big reason for sour house smell, as sticky spills and gunk in the garbage can can make a whole room smell. Clean out the fridge regularly and keep a trash bin for spoiled food or drinks. Scrub the sinks, dishwasher and counters with hot water or a bleach solution to eliminate bacteria. Keep an enzymatic cleaner on hand to break down food scraps and grease.