Short answer
Most mattress care rules are habits, marketing or headlines rather than findings. The well-supported ones are few: wash bedding weekly, keep indoor humidity down, use a protector, and deal with accidents promptly. No study sets a mattress cleaning interval, the 7-year rule is an industry rule of thumb, the unmade-bed claim came from a lab-based model, and bed mites don't bite.
By Matthew Brunken · Updated October 7, 2026 · Last reviewed October 7, 2026 · Sources · Editorial standards
Mattress care is full of confident numbers: clean every six months, replace every seven years, wash pillows monthly, leave the bed unmade to starve the mites. Some of them are sensible habits. Very few came from a study. This hub takes the rules people repeat most and traces each one to its source, so you can tell the well-supported advice from the marketing and the headlines.
This hub is general information about mattress care and allergens, not medical advice. For allergy or skin concerns, talk with a doctor.
Why a hub on care schedules and myths
Ask how often to clean a mattress, wash pillows or replace a bed, and you'll get answers from two years to twenty. People share them as facts, often with "studies show" attached. We wanted to know which studies, so we went looking: allergy practice parameters, randomized trials, extension entomology guides, federal rules and, where it existed, real-world data. The result is a shorter list of well-supported rules than you might expect, and a longer list of things that are habits or guesses.
How often to clean and wash
Start with how often to clean a mattress. We found no study that sets a mattress cleaning interval, so any schedule, including our own twice-a-year suggestion, is a rule of thumb. The interval that does have graded evidence is for bedding: wash sheets and pillowcases weekly. Sources disagree on water temperature, and that article lays out why. The seasonal checklist puts the whole routine on a calendar for a Lincoln or Omaha home.
When to replace
Is the 7-year rule real? traces the number to mattress-industry consumer education and compares it with a 2022 study of discarded mattresses that found an average age of 13.9 years. Replacement myths checks the two-year rule, fixed pillow schedules and the idea that an old mattress is necessarily a dirty one. Our decision center helps with the clean-or-replace choice itself.
Bed mite myths
Should you leave your bed unmade? shows that the famous claim came from a 2005 press release about a lab-calibrated model, with a skeptical allergist quoted in the same coverage. Is autumn mite season? uses published seasonal data from Ohio homes: mites peak in humid summer, and allergen stays high into winter. Sun, freezer, dryer, iron or UV-C explains why every home method, including the UV-C and steam we use, works at or near the surface. And do bed mites bite? answers no, then sets out what does. Our allergens hub covers mite control in depth.
Everyday care
Protectors vs encasings separates spill protection from allergen barriers and reports the trial evidence honestly, including the results that didn't favor encasings. Toppers covers which fills can be washed and when to replace. Rotating, flipping and care labels explains what care label words legally mean and which tags to keep.
Related articles in other hubs
Two companion pieces sit in other hubs. Viral mattress cleaning recipes, ingredient by ingredient looks fairly at detergent-and-iron, vinegar-and-baking-soda and similar home recipes, and why one side of the bed turns darker answers a question about sweat and body oils.
The short list that holds up
After checking dozens of claims, the rules with real support fit on one hand. Weekly washing of sheets and pillowcases carries a graded recommendation in the allergy practice parameter. Keeping indoor humidity down has the strongest home evidence against mites: in a Dayton study, homes held below 51% relative humidity through humid summers ended up with far less mite allergen than homes that weren't. A protector or encasing keeps new soil and allergen from building up in the mattress, though encasings alone rarely change allergy symptoms. Small washables respond to a hot dryer cycle or a night in the freezer. And accidents are best handled promptly, by blotting rather than soaking.
Almost everything else is a habit, a rule of thumb or a misreading. That doesn't make those habits bad. Rotating a mattress, airing a bed in the morning or putting bedding in the sun are all reasonable things to do. They simply aren't the evidence-backed rules they're often presented as, and none of them replaces the short list above.
Why myths spread so easily
Care rules are easy to share and hard to check. A number like seven years or six months sounds precise, a headline about mites starving in an unmade bed is memorable, and a fixed schedule is simpler to follow than a judgment about condition. Many of the claims we traced began with something real, a press release, an industry guide or a lab model, and lost their caveats as they traveled. Our approach is to restore the caveat rather than to mock the claim.
How we handle evidence here
We lean on primary sources: an allergy practice parameter, randomized trials and Cochrane reviews, extension entomology guides, federal regulations and published data. We refer to industry groups generically in our text and name them in the source lists. Where a source has a conflict of interest, as the practice parameter notes for its encasing section, we say so. Where we give our own suggestion, such as a twice-a-year cleaning rhythm, we label it as ours.
Sleep Sanitation's position
This section is our view. The best mattress care is mostly free: weekly sheets, a washed protector, sensible humidity and prompt attention to accidents. A deeper cleaning is one step among those, not a replacement for them, and it works at the surface, where skin flakes, dust and spills collect. Our visits use dry vapor steam with little water, HEPA vacuuming and UV-C light, and every visit includes two checks: a moisture check after service and the built-in bed mite sensor on our UV-C vacuum. We serve Lincoln, Omaha and surrounding towns. See our process, call or text (402) 512-5658, or email info@sleepsanitation.com.
What we don't know
- Whether any mattress cleaning interval changes allergen, odor or mattress life over time. We found no study comparing intervals.
- What happened to the 36-house field test planned in 2005 to check the unmade-bed model. We found no published result.
- How mite and allergen seasonality in Nebraska homes compares with the Ohio data. We found no local survey.
Changelog
- 7 October 2026: First published. Sources accessed on this date.