Knowledge
In-depth articles on cleaning chemistry, soap, and how to compare products independently.
Best deck soap 2026 — how to choose
How to choose the right deck soap — comparison of Swedish brands on oil type, superfatting and price.
Published 2026-04-23What is soap? Chemistry, history and types
What soap is, how it's made, the difference between linseed, rapeseed and tall oil soaps — and why superfatting matters.
Published 2026-04-23Clean washing machine
Complete guide for natural cleaning and descaling of the washing machine.
Published 2026-05-23Sour-smelling towels — cause and fix
Why towels smell sour — chemistry and three practical solutions.
Published 2026-05-23Clean oven door — inside, outside and between glass layers
Three layers of glass, different grease patterns. Natural methods per zone.
Published 2026-05-23Baking soda — uses, chemistry, safety
What baking soda is, how it works chemically, when it works and when it doesn't.
Published 2026-05-23Vinegar in cleaning — what works and what doesn't
Chemistry, safety, and what to use vinegar for (and not).
Published 2026-05-23Witch soot — what it is and how to remove it
Black soot on walls near heat sources — causes and removal methods.
Published 2026-05-23Cleaning rugs in snow — how it works
Traditional Swedish rug cleaning method explained.
Published 2026-05-23Detergents — categories, enzymes, choice
White and color wash, enzymes, fragrance-free, natural.
Published 2026-05-23Hand-washing clothes — when, how, with what
Wool, silk and delicate materials — complete hand-wash guide.
Published 2026-05-23Mop floors — complete guide per floor type
Wood, parquet, tile and vinyl — each floor type has its method.
Published 2026-05-23Clean oven with soap — complete guide
Step-by-step + chemistry behind natural oven cleaning. Recommended products and troubleshooting for burnt-on grease.
Published 2026-05-07Super-fatted soap — what it is and who makes it
Explanation of the category, optimal percentage (5–10 %), and Swedish producers.
Published 2026-05-07Soap in northern Sweden — tradition and today's makers
Why northern Sweden became the heartland of Swedish soap-making, and today's producers.
Published 2026-05-07Soap types and how to read comparisons critically
Swedish soap terminology demystified. Why more oil isn't always better, and how to spot bias in soap comparisons.
Published 2026-04-24Linseed vs tall vs rapeseed oil in soap
Technical comparison of four oils in Swedish soap manufacturing — drying, semi-drying, non-drying and what that means in practice.
Published 2026-04-24pH in cleaning — alkaline vs acidic cleaners
Why match pH to stain type? Complete reference of common cleaners and what they actually work on.
Published 2026-04-24Wash symbols — complete guide
All wash symbols explained: washing, bleaching, drying, ironing, dry cleaning. ISO 3758 in plain language.
Published 2026-04-24Our methodology
How Fläckfri tests, ranks and recommends products. Criteria, weighting, conflicts of interest — disclosed openly.
Published 2026-04-24