Official agencies
EPA, CDC/ATSDR, CPSC, USDA and other relevant public authorities for safety or health boundaries.
Evidence hierarchy
Sources should make the limits clearer.
A link is not automatically evidence. We choose sources according to the risk and specificity of the claim.
Our hierarchy
The higher the risk, the stronger the source.
A simple return-basket routine does not need the same evidence as hydrogen-sulfide safety, dryer fire prevention or food storage. Our sourcing level changes with the consequences of being wrong.
01 — Preferred sources
What we look for first.
Manufacturer instructions
The model-specific manual remains the authority for appliance installation, maintenance and approved cleaning methods.
Primary references
Standards, extension services and original documentation are preferred over copied summaries.
Practical observation
Used for low-risk workflow design, never presented as proof of medical or technical performance.
02 — Sources we treat cautiously
Popularity is not validation.
- Unattributed social videos and copied cleaning recipes.
- Affiliate pages that do not separate testing from sales copy.
- AI summaries without traceable primary references.
- Anonymous claims, universal fixes and unsupported health promises.
03 — Conflicts & gaps
We say when certainty is limited.
If official guidance differs by appliance, material, location or building code, the article directs the reader to the relevant manual or qualified local professional. Missing evidence is not filled with a confident guess.