Here are some window and glass cleaning detergents which do not contain methylisothiazolinone, methylchloroisothiazolinone or other related preservatives.
Aspen Clean (Canada)
Glass cleaner from this natural brand — with organic lime essential oil.
Attitude (Worldwide)
A Window and Mirror Cleaner available in the UK from Ocado, and in the US available from Amazon.
Bio-D (UK / US)
All their products are MI free — they do a Glass and Mirror Spray, stocked by The Ethical Superstore in the UK.
Bondi Wash (Australia / Europe)
Isothiazolinone home and personal care brand, which offer a glass spray — available in Australia and throughout Europe.
Eco Max (Canada)
MI-free brand which has a Hypoallergenic Glass Cleaner, preserved with food grade potassium sorbate.
Ecostore (Australia / NZ)
Isothiazolinone-free brand, which have a glass and surface cleaner, here (Australia) and here (NZ).
GreenShield (US)
Their Organic Glass Cleaner in Fresh Mint is isothiazolinone free, as is their entire range.
Natural Home Logic (US)
Their Glass Cleaner — like their whole range — is MI-free, but has mixed reviews on Amazon US.
Nature Clean (Can)
Glass & Window Cleaner with a very simple formulation, and containing witch hazel extracts.
Pure Haven Essentials (US)
Have a Glass Cleaner that comes with a refill, and is made using white wine vinegar, glycerin and mint essential oils.
Sun & Earth (US)
Isothiazolinone-free brand, who offer a Plant-Based Glass Cleaner.
TINCTURE (UK)
High-end and luxury household cleaning brand from Norfolk, who offer a Glass and Mirror Tincture among their range.
Violet’s (UK)
Glass and Mirror Polish from Northumbrian Botanicals brand. Find it here.
Vitacost (US)
Their Clean Collection Glass Cleaner is unscented / fragrance free. (NB: There is a current question mark over Vitacost as we’ve had reports of a severe reaction. We are currently investigating.)