Dryers that don’t dry, vacuum cleaners that don’t clean, and air conditioners that don’t cool may all be plagued by the same problem: a clogged or dirty filter. To keep many top-performing appliances in tip-top shape, you have to clean or replace a filter. In fact, that’s the first thing to check when something seems awry. When Consumer Reports tests vacuums, air conditioners, dishwashers, and other appliances, filter replacement is one of the things we consider as part of our ease-of-use score. [More]