Adopting eco friendly habits can be easier taken one small step at a time. Lots of small changes add up to a big difference.
I try to avoid buying anything made from plastic, so I was very happy to discover I could buy a wooden toilet brush with natural (plant based) bristles (mine is from Labour and Wait, you can buy the loo brush on its own for £5, or a set with brush and holder for £18. I use a white ceramic plant pot as a holder, it was 50p from the charity shop and works perfectly well).
I don't know how long toilet brushes should last, but my old wooden loo brush kept going for three and a bit years, with regular disinfecting!
Unlike a plastic brush, when finished with this brush will eventually rot away to nothing.
Being eco-friendly isn't very glamorous sometimes!