Alma Win (UK)
Their Organic Glass and Window Cleaner Concentrate is safe.
All their products are MI free – they do a Glass and Mirror Spray.
Eco Max (Canada)
MI-free brand which has a Hypoallergenic Glass Cleaner, preserved with food grade potassium sorbate.
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, and has excellent reviews on Amazon US.
Mangle & Wringer (UK)
Good for Glass, for glass and mirrors, contains only water, acetic acid, lemon oil, soap and preserving salts.
Sun & Earth (US)
Isothiazolinone-free brand, who offer a Natural Glass Cleaner.
High-end and luxury household cleaning brand from Norfolk, UK, who offer a Glass and Mirror Tincture among their range.
Their Clean Collection Glass Cleaner is unscented / fragrance free.