Ever wonder how often you should toss or replace items around the house? Some common household items accumulate dust, dirt and mold more quickly than others. Here's the skinny on which should get your frequent attention so they don't become infested with germs:

• Air Filters
• Cutting Boards
• Food Storage
• Pillows
• Sheets
• Sponges
• Toothbrushes
• Towels

Air Filters: Your air conditioning filter accumulates dirt and dust. Those airborne contaminants are an allergy and asthma sufferer's worst enemies and may be responsible for recirculating illness. Change disposable filters monthly, or wash reusable filters in hot soapy water and air dry before replacing.

Cutting Boards: The Environmental Protection Agency says soap and water will effectively kill the bacteria on a cutting board surface. Try a scrubby brush for nicks and crannies. Keep a separate vegetable and meat board, and replace wood boards when they're fairly nicked up. Once plastic and wooden boards are cut up, even a thorough cleaning won't eliminate all germs deep down.

Food Storage: Tasting or sniffing that container of yogurt in the back of your refrigerator isn't always the best way to judge if it's still good. You can take the guesswork out by using our printable food safety storage timeline from Texas A&M University that tells you how long foods can be saved for.

Pillows: The National Library of Medicine recommends replacing pillows every three years. Since pillows collect dander and body oils, they're a breeding ground for dust mites ‑- a major cause of allergies and upper respiratory infections. Cleaning them is nearly impossible since fibers break down, mat up and, over time, won't offer neck and head support. Wash your pillowcases at least once a week to keep your skin clean and clear.