Simple Green All-Purpose Cleaner is not toxic by standard safety measures. The product is more than 84% water, and its safety data sheet classifies it as non-toxic through oral, skin, and inhalation routes. That said, “non-toxic” doesn’t mean completely harmless in every situation, and a few ingredients deserve a closer look, especially if you have pets or small children.
What’s Actually in Simple Green
The formula is mostly water, with a handful of cleaning and stabilizing agents making up the rest. The key ingredients beyond water include ethoxylated alcohol (less than 5%), which is a surfactant that breaks up grease and grime, and sodium citrate (less than 5%), a salt derived from citric acid that helps soften water and boost cleaning power. Sodium carbonate, citric acid, fragrance, and colorant each make up less than 1%.
The one ingredient worth knowing about is an isothiazolinone mixture, present at less than 0.2%. Isothiazolinones are preservatives used in many household products to prevent bacterial growth. They’re a known skin sensitizer for some people, meaning repeated exposure can trigger contact dermatitis in individuals who develop an allergy to them. At 0.2% or less, the concentration is low, but it’s not zero.
Toxicity by the Numbers
Toxicologists measure a product’s danger using something called an LD50, which is the dose needed to be lethal in 50% of test animals. Simple Green’s oral LD50 in rats is greater than 5.0 grams per kilogram of body weight, and its skin LD50 in rabbits exceeds 2.0 grams per kilogram. To put that in perspective, substances with an oral LD50 above 5.0 g/kg are placed in the lowest toxicity category. Table salt has a similar profile. You’d have to consume an enormous quantity for it to cause serious harm.
For inhalation, the manufacturer classifies Simple Green as non-toxic but notes that breathing in mist from the concentrated formula can cause mild irritation to the nasal passages or throat. If that happens, moving to fresh air resolves it. This is a concern mainly when spraying the concentrate in a poorly ventilated space, not when using the diluted product in a normal room.
Skin and Eye Contact
Simple Green can cause mild irritation on prolonged skin contact, particularly with the concentrate. If you’re cleaning with undiluted product for an extended period, wearing gloves is a reasonable precaution. Brief contact with diluted Simple Green is unlikely to cause problems for most people.
Eye contact is more of a concern. Like most cleaning solutions, getting Simple Green in your eyes will sting and can cause redness. Flushing with water for several minutes is the standard response. The product doesn’t contain corrosive ingredients, so permanent damage is not expected, but irritation can last for a while.
Safety Around Pets and Children
Simple Green’s low toxicity profile means an accidental lick or brief contact isn’t likely to cause a medical emergency. However, pets face a unique risk that humans don’t: they groom themselves by licking their fur and paws. If you clean a floor with Simple Green and your dog or cat walks across it before the surface dries, they’ll ingest small amounts during grooming. Over time, repeated low-level exposure to any cleaning product can cause gastrointestinal irritation.
Birds and reptiles are far more sensitive than dogs or cats to airborne chemicals, including aerosolized cleaning products. If you keep birds, avoid spraying any cleaner near their enclosure and ensure the room is well ventilated before bringing them back in. Signs of chemical irritation in pets include clear nasal or eye discharge, sneezing, coughing, skin irritation, and diarrhea.
For children, the main risks are the same as for any household cleaner: drinking it from the bottle or rubbing it in their eyes. Store it out of reach, and let surfaces dry before letting toddlers crawl on them.
Using Simple Green on Food Surfaces
Several Simple Green products are registered with NSF International for use in and around food processing areas, including Crystal Simple Green and Simple Green Pro Food Service Cleaner. However, these registrations come with a critical requirement: after cleaning, all surfaces must be rinsed thoroughly with drinkable water before food touches them. The standard green-label All-Purpose Cleaner is not the same as these food-service formulations, so if you’re cleaning kitchen counters or cutting boards, the Crystal or Pro Food Service versions are the better choice, and rinsing afterward is not optional.
Environmental Impact
Simple Green markets itself as biodegradable, and its water-based, surfactant-light formula supports that claim. Biodegradability testing under international standards requires that at least 60% of a product breaks down within a 28-day window. The formula’s reliance on citric acid derivatives and plant-compatible surfactants makes it less persistent in waterways than petroleum-based cleaners. That said, the fragrance and colorant components are proprietary, so their individual environmental profiles aren’t publicly disclosed.
The Bottom Line on Safety
Simple Green sits firmly in the “low risk” category for household cleaners. It won’t poison you, your kids, or your pets through normal use. The realistic hazards are mild: skin irritation from prolonged contact with the concentrate, eye irritation from splashes, and minor throat irritation from breathing heavy mist in a closed room. Diluting the product as directed, ventilating the area, and letting surfaces dry before pets or children use them eliminates most of these concerns.