Gut epithelial barrier damage caused by dishwasher detergents and rinse aids
Lab research on professional dishwasher chemicals suggests that certain rinse aids, particularly those containing alcohol ethoxylates, can leave residues on dishware that damage intestinal barrier cells in vitro. Commenters note that these concentrations were not reproduced in household machines, debate how relevant the findings are to everyday use, and share strategies such as skipping rinse aid, using citric acid or alternative detergents, and being cautious about restaurant hygiene.
Scope of the study and strength of evidence
- Study built an intestinal epithelial cell layer in vitro and exposed it to detergents/rinse aids; high concentrations damaged cells and barrier function.
- Key toxic component identified as alcohol ethoxylates in rinse aids.
- Multiple commenters stress it was done at concentrations used in professional/restaurant machines; some call the title/headlines sensational.
- Others note the paper says a “significant remnant” of rinse aid remained on professionally washed dishware. Interpretation of “remnant” and what counts as “significant” is debated.
Professional vs household dishwashers
- Many emphasize the main risk is from professional machines:
- Less water, higher detergent/rinse-aid concentrations, and shorter cycles.
- Study reportedly could not reproduce the same effects on household machines.
- One commenter points out that small changes in rinse water volume could move consumer machines into a potentially concerning range, arguing more research is needed.
- Several people worry more about eating out, where they can’t control products used. Others reply that regulations, inspections, and sanitation cycles provide some safety baseline.
Rinse aids, ingredients, and exposure
- Alcohol ethoxylates (and related ethoxylated surfactants) are reported in many rinse aids and dishwasher pods.
- Some rinse aids are said to be alcohol-ethoxylate–free; powders and basic gels are suggested as likelier options, though ingredient lists vary by brand and country.
- One commenter links a paper suggesting alcohol ethoxylates break down relatively quickly in wastewater, but combined environmental effects remain “unclear”.
User practices and alternatives
- Some users have stopped using rinse aid entirely and report minimal differences, especially with soft water or built-in rinse aid in tablets.
- Citric acid solution (around 10%) is used by some as a rinse-aid substitute, sometimes recommended in manuals.
- Reported downsides: pitting of stainless steel, removal of printed markings on glassware.
- Vinegar is discussed as an alternative but several note it can damage rubber seals and some plastics; others report long-term use without visible issues.
- Soft-water settings and dishwasher salt are used to reduce spotting and possibly lower rinse-aid needs.
Health anecdotes and sensory cues
- Reports of:
- Persistent hand eczema after operating a professional dishwasher.
- A chemical burn/ulcer from spilled commercial detergent.
- Stomach upset from metal straws washed in the dishwasher, resolved by handwashing.
- Being able to smell detergent/rinse-aid residue on “clean” dishes and avoiding dishwashers for that reason.
- Several people express long-standing habits of thoroughly rinsing hand-washed dishes due to distrust of soap residues; others note in some places it’s common not to rinse.
Dining-out practices and broader food safety
- Thread digresses into comparisons of home vs restaurant food poisoning risk, regulatory oversight, and kitchen hygiene.
- Some describe alarming bar/coffee-shop glasswashing routines with minimal rinsing or strong sanitizer/bleach odors, reinforcing concern about chemical residues.
Regulation and product safety expectations
- Some argue that mass-market products like dishwasher detergents and rinse aids should face much more extensive, nuanced safety testing (not just pass/fail), proportional to their widespread use.