Chlorinated solvents — primarily dichloromethane (DCM, methylene chloride), trichloroethylene (TCE), and perchloroethylene (PERC) — are powerful degreasers used in paint strippers, oven cleaners, stain removers, and engineering degreasers found in the domestic environment. They are among the most acutely toxic cleaning chemicals available to consumers without restriction: DCM is a confirmed carcinogen that has caused multiple domestic fatalities from bathtub refinishing, TCE is an IARC Group 1 carcinogen, and PERC is classified as probably carcinogenic to humans.
Where it's found
Paint strippers containing DCM are still sold in the EU and UK for professional use and can be purchased online by domestic users. Aerosol degreasers for engine parts, chains, and mechanical components contain chlorinated solvents and are used in home garages and workshops. Dry cleaning fluid — PERC is the dominant dry cleaning solvent and is found in brought-home dry-cleaned garments. Stain removers and spot cleaners for upholstery and carpet. Some branded oven cleaner formulations in non-EU markets. TCE is found in some metal cleaning, rust removal, and electronics contact cleaning sprays available from hardware stores.
Routes of exposure
Inhalation is the dominant acute route — DCM is extremely volatile and concentrations build rapidly in enclosed, unventilated spaces such as bathrooms, kitchens, and garages. Dermal absorption occurs with direct skin contact. Oral ingestion is a risk for children accessing stored products. Dry-cleaned clothing releases PERC vapour into car and home environments — studies show detectable PERC in home air following return of dry-cleaned items. Workers and residents near dry cleaning establishments have elevated PERC body burdens from outdoor air exposure.
Health concerns
DCM is metabolised in the liver to carbon monoxide, which binds haemoglobin and causes carboxyhaemaglobin formation — indistinguishable from CO poisoning. Multiple fatalities from bathtub refinishing using DCM-based strippers in unventilated bathrooms are documented, including several in the UK. DCM is classified by the IARC as a Group 2A probable carcinogen. TCE is an IARC Group 1 confirmed carcinogen — evidence includes links to kidney cancer, non-Hodgkin lymphoma, and liver cancer. PERC is classified as probably carcinogenic to humans (IARC Group 2A) and is associated with bladder and oesophageal cancer in dry cleaning workers. All three are CNS depressants at high concentrations, causing dizziness, confusion, and loss of consciousness.
Evidence
Acute toxicity of chlorinated solvents, including the CO-generation mechanism for DCM, is firmly established. IARC Group 1 classification for TCE reflects sufficient human evidence for kidney carcinogenicity. Fatal incidents from DCM paint stripper use in domestic settings are documented in regulatory case series in the US, UK, and EU and formed the basis for regulatory action. PERC Group 2A classification is based on strong animal evidence and occupational epidemiology. The evidence base for this chemical class is among the strongest for any group of cleaning chemicals.
Who's most at risk
DIY enthusiasts using paint strippers or engine degreasers in garages, bathrooms, or other enclosed spaces face the highest acute risk. People living above or near dry cleaning shops are exposed to PERC chronically through contaminated air. Residents of buildings where bathtub or surface refinishing using DCM strippers is carried out are at acute risk even if not performing the work themselves. Children accessing stored chlorinated solvent products face acute ingestion hazard.
Regulatory status
RegulationDCM-based paint strippers were banned for consumer use in the EU by Regulation (EU) 2017/227 (effective 2019 for consumer products, earlier for professional use in some applications). The US EPA restricted DCM paint strippers for consumer use in 2019 following multiple documented fatalities. PERC use is regulated under the EU Solvents Directive and subject to emission limits for dry cleaning establishments. TCE is an SVHC under REACH, with many uses restricted or requiring authorisation. Occupational exposure limits exist for all three compounds in the UK and EU.
How to reduce your exposure
Do not use DCM-based paint strippers in enclosed domestic spaces — this is a genuine fatality risk. If you encounter a DCM-containing product, use it only outdoors with strong through-ventilation and full respiratory protection, or ideally substitute with a safer alternative (caustic-based or gel strippers are effective for many applications). Allow dry-cleaned garments to air out in a ventilated space before bringing into the home — hang outside or in a well-ventilated porch for 24–48 hours. Check labels on aerosol degreasers before use; those containing DCM, TCE, or PERC should be used only in well-ventilated conditions outdoors.
The nutrition connection
The presence of confirmed and probable human carcinogens in readily available household and DIY products underscores the regulatory gap between what the label says and what the toxicological profile warrants. DCM fatalities from bathtub refinishing occurred in homes identical to many readers' own environments — the risk is not theoretical. The Nutriofia perspective here is straightforward: the most effective exposure reduction for this chemical class is avoidance and substitution. Safer alternatives exist for almost every application where consumers encounter chlorinated solvents, and the risk-benefit calculation — a carcinogenic solvent versus a slightly less convenient alternative — is unambiguous.