Affresh washing machine cleaner is mildly toxic. Its safety data sheet carries the signal word “Danger” and classifies it as harmful if swallowed, irritating to the eyes, and an oxidizer that can intensify fire. That said, when used as directed in an empty washing machine cycle, the risk to you and your household is low. The concerns are really about direct contact with the tablet itself and accidental ingestion.
What Makes Affresh Potentially Harmful
The primary cleaning agent in Affresh tablets is sodium percarbonate, an oxygen-based bleaching compound. When dissolved in water, it breaks down into hydrogen peroxide and soda ash, both of which do the actual cleaning. In tablet form, though, the concentrated powder is a different story. Sodium percarbonate is severely irritating to the eyes, mildly irritating to the skin, and can irritate the respiratory tract if you breathe in dust or particles from a crumbled tablet.
The product’s official hazard classification puts it at “Acute toxicity: Category 4,” which is the lowest category on the acute toxicity scale. In practical terms, this means swallowing a tablet could make you sick, but it’s not in the same league as drain cleaner or antifreeze. The tablet is also classified as an oxidizing solid, meaning it can feed a fire if stored near flammable materials. This is why the label says to keep it away from heat and combustibles.
Handling the Tablets Safely
The manufacturer specifically warns against touching the tablets directly. If you handle one with bare hands, wash your hands thoroughly afterward. If tablet dust or residue gets in your eyes, rinse with water for several minutes and remove contact lenses if you’re wearing them. Skin contact with water and the dissolved product is generally not a concern at the dilution levels inside a full washing machine cycle, but contact with the dry tablet itself can cause irritation for some people.
A harmful concentration of airborne particles can build up quickly if a tablet is crushed or crumbled, especially in a small space like a laundry closet. Don’t break tablets apart. Drop them whole into the drum.
Risks to Children and Pets
The biggest real-world danger with Affresh is accidental ingestion by a child or pet. The tablets are small, brightly colored, and could easily be mistaken for candy or a treat. Swallowing one would be harmful, not just because of the chemical irritation to the mouth and throat, but because the oxidizing reaction could cause nausea and stomach distress. If a child swallows a tablet, rinse their mouth and contact poison control. For pets, the ASPCA Poison Control hotline is (888) 426-4435. Store the tablets in their original packaging, sealed and out of reach.
Does Residue Stay in the Machine?
This is the question most people are really asking: is it safe to wash clothes in the machine after using Affresh? The answer is yes. Sodium percarbonate breaks down into hydrogen peroxide and soda ash during the wash cycle, and both are flushed out with the rinse water. Hydrogen peroxide further decomposes into just water and oxygen. There’s no persistent chemical film left on the drum. Running a normal wash cycle after using the tablet, as the instructions suggest, clears out any remaining traces.
The product is not classified as a skin sensitizer, meaning it’s unlikely to trigger allergic reactions from trace residue. If you have unusually sensitive skin or a known allergy to oxygen bleach products, running an extra empty rinse cycle after the cleaning cycle would add a margin of safety.
How It Compares to Other Cleaners
Affresh is less hazardous than many common household cleaners. Chlorine bleach, for example, produces toxic fumes, can cause chemical burns, and reacts dangerously with ammonia or acids. Sodium percarbonate doesn’t produce chlorine gas and breaks down into benign byproducts. It’s the same oxygen-bleach chemistry found in products like OxiClean.
That doesn’t make it harmless. “Less toxic than bleach” still means it demands basic precautions: don’t eat it, don’t rub it in your eyes, don’t crush it and breathe in the dust, and keep it away from kids, pets, and anything flammable. Used as intended, dropped whole into an empty washing machine drum and run through a cycle, the tablet dissolves completely and poses no meaningful risk to anyone in the household.