Pick a cleaner to match the grime
#0025 Home & daily life
Fact rank
A
Confirmed by explanations from two cleaner manufacturers. Following a journal paper, the "neutralization" explanation is not used
Wow rank
S
Includes a correction to the familiar "acidic grime / alkaline grime" explanation
Usefulness
S
Immediately useful for choosing cleaners all around the house
Verification: Supported by evidence
AI verification reports the evidence it found; it does not guarantee that a claim is true.
Fingerprints, skin oil and grease come off more easily with alkaline cleaners (baking soda, sodium sesquicarbonate and the like), and limescale with acidic ones (citric acid, vinegar).
Why
Whether a cleaner works depends on how it pairs with what the grime is made of. Fatty acids in skin oil react with alkalis and come away more easily, while calcium and other main components of limescale dissolve in acid.Evidence
Primary Explanation by a cleaner manufacturer (Seikatsu to Kagaku Sha): fingerprints, grease and tobacco tar can be removed with alkali; so-called limescale is the grime that acid removes link
Primary Explanation by Kao: fatty acids in skin oil react in weakly alkaline wash water and come away more easily link
Primary Komatsu and Oya, "Problems with the acid–alkali neutralization theory of cleaning", Journal of Home Economics of Japan 72(4), 2021: describing poorly water-soluble limescale as "alkaline grime" is inappropriate link
Notes and limits
Grime is often described as "acidic" or "alkaline" and said to be removed by neutralizing it, but a 2021 paper in the Journal of Home Economics of Japan calls that description inappropriate for poorly water-soluble grime such as limescale. This article covers only which cleaner works on which grime. Mixing chlorine-based cleaners with anything acidic releases a toxic gas.
Derivations