How the shortlist works
This shortlist takes up to six distinct references from nine qualified listings across stain removers and laundry boosters, ordered by the same editorial rating used on every comparison. A product qualifies only if its stored Amazon listing text says fragrance-free, free & clear, unscented or scent free. Kits and bundles that also contain a scented or undocumented item are excluded.
Every product shows a published editorial rating calculated from captured Amazon reviews and listing documentation. We have not tested stain removal, colorfastness or fabric durability. We do not infer composition, concentration, dose or compatibility from a brand name. The exact current product label controls use.
Chemical stain products state no comparable numeric specification (volumes track pack size, not effectiveness), so the attribute component uses the documentation completeness index below. Comparator positions use the 45/35/20 public-review blend, not measured cleaning performance.
Where a listing has no documented spec-fit inputs, our documentation completeness score is 100 × [0.5 × min(documented feature bullets / 8, 1) + 0.3 × min(product images / 5, 1) + 0.2 × (brand documented ? 1 : 0)], rounded to a whole number and shown as a 0–10 rating. Every input is read from the stored Amazon listing record, so the same listing always produces the same score. This measures how completely the listing is documented — it is not a performance test, a quality measurement or a customer review.
Where Amazon publicly displays customer reviews for a listing (average star rating and review count captured from the public product page), the raw editorial score is 100 × [0.45 × (Amazon average / 5) × min(review count / 50, 1) + 0.35 × min(log10(1 + review count) / log10(1 + 5000), 1) + 0.20 × documentation score / 100]. The confidence factor min(review count / 50, 1) damps averages based on very few reviews, and the logarithmic volume term rewards large public review volumes, so widely and highly reviewed listings rank ahead of thinly reviewed ones. Listings with no captured public review data use the documentation score alone. This combined index reflects the public Amazon reputation and the listing documentation — it is not a physical test and not our own product testing.
The displayed editorial rating is the raw blended score divided by 10, shown to one decimal on a 0-10 scale. There is no catalog normalization, rank interpolation, forced winner, forced floor or artificial gap. Equal scores remain equal: the available data does not justify a distinction. Ranking uses the unmodified raw score descending, then listing slug for exact ties; slug is a stable identifier, not a quality signal. The same raw score always has the same display rating in every shortlist. This is not a physical test result or an Amazon customer rating.
Limits and checks before buying
Read the care label and product label and spot-test a hidden area before any permitted treatment. Stop if dye transfers or the texture changes. A label prohibition takes priority over a successful-looking spot test.
Never mix cleaning products. Bleach must not be mixed with ammonia, acids or other cleaners. Keep containers labeled and follow ventilation, storage and protective-equipment instructions. Ask a professional cleaner about dry-clean-only, valuable or unknown materials.
Care and chemical-safety sources: FTC care-label guidance and Washington Department of Health.
Inspect before drying and do not assume that heat, extra concentration or repeated attempts will improve the result. Explore all fabric care categories.
