Here is a list of manufacturers producing laundry detergents / softeners free from isothiazolinones. As formulations change regularly, please double check before purchasing.
Arm & Hammer (US)
Not all of this brand’s products are safe, but their Sensitive Skin Free & Clear Laundry Detergent, easily available, including via Amazon and Target, which is fragrance free too, is widely liked by the online isothiazolinone-allergic community.
Aspen Clean (Canada / US)
Natural laundry detergents in Unscented, Eucalyptus & Rosemary, and Lemongrass & Lavender. Find them here.
Attitude (Canada / US)
Laundry detergents, stain removers, fabric fresheners and fabric softeners. Visit their site here. Also on Amazon (US) and Amazon (UK).
Bio-D
Their Concentrated Laundry Liquid is also free from fragrance and from SLS (sodium lauryl sulphate). Their fragrance-free Concentrated Laundry Powder is recommended, and they offer various types of Concentrated Fabric Conditioner (some with fragrance, one fragrance free). In the UK, they are extensively stocked by The Ethical Superstore and by Big Green Smile.
Defunkify (US)
Confirmed MI-free Active Wash Laundry Detergent — as well as Active Gear products to deodorise shoes and other gear which cannot be laundered. Click here to learn more.
Distinctive
Two online-confirmed MI-free washing powders — in masculine fragrance, and relaxing fragrance. See their website. The relaxing fragrance is available via Amazon.
Earthview (US)
Fabric softener and laundry detergent — free from fragrance, petrochemicals, parabens and much more, including MI. Click here.
Eco-Max (Canada)
Several laundry washes — including a hypoallergenic version — as well as a fabric softener. Use food-grade potassium sorbate as a preservative. See here.
Eco Me (US)
A selection of laundry liquids and detergents from this US brand, including a fragrance free option. Check Amazon for details.
Ecostore (Aus / NZ)
Laundry powder, liquid, stain remover / soaker, fabric softener. Brand has an isothiazolinone-free policy. Shop online here (Australia), or here (New Zealand).
Ecover
Most, but not all, Ecover products are safe.
Their Stain Remover is not safe. In the US, their 2X laundry liquid products are not safe.
For full details, see this article.
Ecozone (UK)
All their laundry products are safe (although note that three of their spray cleaners are not: see this article for more details). They are stocked by Ethical Superstore.
Faith in Nature (UK)
Offer an excellent concentrated Laundry Liquid, including in bulk sizes.
Greenscents (UK)
Their Laundry Liquid is also free from SLS. Their Laundry Conditioner is also suitable. Both are available in three fragranced options, plus one unfragranced.
Mangle and Wringer (UK)
Their completely natural Pure Laundry Powder is additionally free from synthetics, petrochemicals, fragrance and optical brighteners.
Meliora Cleaning Products (US)
Laundry powders and soaps. Free from fragrances, dyes, preservatives and brighteners, with 100% disclosure on ingredients. Click here to learn more.
Molly’s Suds (US)
Have a few very specific liquid detergents — such as their All Sports ActiveWear Detergent and SWIM Swimsuit Cleaner — plus they have a selection of laundry powders. A new mint-scented laundry detergent, confirmed free of MI, is coming soon. Browse here.
Mulieres (UK)
European brand of natural household detergents. Use gentle preservatives such as potassium sorbet and sodium benzoate. Vegan too. In the UK, some products are available from Big Green Smile. Offer an ultra-gentle fragrance free option.
Rockin’ Green (US)
Their powder products and soon-to-be-released liquid detergent products “are all free of isothiazolinone preservatives”, we have been informed. Browse here.
Sodasan (UK)
Colour detergent, ‘laundry fragrance and care rinse’, detergent powder, oxygen bleach – and a sensitive detergent, which is fragrance free, and ideal for those with sensitive skin. Click here.
Surcare (UK)
Their Non-Biological Laundry Liquids are fragrance free and designed for sensitive skin. Find them here.
(Warning: This brand’s Fabric Conditioner contained isothiazolinones until a reformulation in around 2016; it is now unlikely old bottles still remain in circulation.)
Violet’s Natural Laundry (UK)
Fabric Softener, Fine Fabrics Wash, Laundry Powder, and Laundry Detergent in various scents, including unscented. Browse here.