I have posted before/after shots of the toilet, sink, floor, tub and mirror. I have also posted a photo of the cleaners that I used, which I'll describe below. For good measure, I included some extra "detail" shots of clean surfaces, taps, etc.
Most of the cleaning was done using warm water and a rag, which I rinsed regularly. As required, this was >80%. I sprayed a little de-greaser onto the bath to remove the residue left over from bathing and I used a little of the toilet cleaner to disinfect the bowl, but that is all.
The cleaners used are Ecover brand that we refill from a local zero-waste store. The bottles last us forever as we use them so sparingly (I've posted links to the cleaners below - as you can see the packaging has changed since we bought our de-greaser spray)
Ecover multi-action spray
Ecover toilet cleaner
The cleaners are plant-based and readily biodegradable. From the website: "Plant-powered, biodegradable ingredients".
Edit: re-uploaded Floor images in a higher resolution. Sorry about the hair, it feels quite gross sharing this on the internet.
Edit 2: same for Mirror - before. I'm not sure why they look so small.