One example (find via Sci-Hub/library): “Chemical removal of struvite from wastewater pipes using sodium hydroxide” – often appears in Water Environment Research or Urban Water Journal . Search: "sodium hydroxide" porcelain enamel corrosion or "caustic soda" PVC pipe degradation Why useful: Toilets are vitreous china (acid/alkali resistant but prolonged high-concentration NaOH can etch glazing). PVC is generally fine up to ~50°C and moderate NaOH. 4. Occupational Health Paper – Plumbing injuries from caustic drain cleaners Search in PubMed: "sodium hydroxide" toilet cleaner eye injury or "caustic ingestion" accidental toilet cleaner Example: Journal of Emergency Medicine – case reports of children drinking from toilets containing undissolved NaOH pellets. How to get a “useful paper” quickly If you need one specific, practical paper to cite or guide action, I recommend: