Attitude (Canada / Worldwide)
Window & Mirror, Bathroom, and Daily Shower Cleaners — all free from all isothiazolinones. See their site here, or via Amazon US here.
In the UK, you can buy a selection of products from Planet Organic.
Their toilet cleaner, in various sizes. Ingredients seem to be straightforward and natural — acids, coconut oil detergents, vegetable derivatives and lemongrass.
Eco Me (US)
They have a Herbal Mint Toilet Bowl Cleaner.
Greenshield Organic (US)
Their Bergamot Mint Bathroom Cleaner contains almost entirely organic ingredients — citric acid, l-malic acid, soybean oil, fragrance, acetic acid, soap bark, glycerin and water.
Home Scents (UK)
Toilet Cleaner, bleach and descaler. Click here.
Toilet Freshener — uses only bicarbonate of soda, citric acid and essential oils — a Multi Surface Spray for bathroom (and kitchen) surfaces — with only castille soap and essential oils (fragrance free available) — and a Soft Cleaning Paste, which is also multi-purpose, but can be used in the bathroom as well as elsewhere, and which contains bicarbonate of soda, castille soap and essential oils.
Mangle and Wringer (UK)
Their Bathroom Balm is a biodegradable cream with only very simple non-reactive ingredients, such as bicarb, soap and glycerine.
Bathroom and glass cleaner.