How to deal with the lack of brush in the toilets

It's a recuring problem for me. I do my job, leave a big mark in and outside the water and there is nothing to clean up. Flushing isn't enough.

The only way I can find is take toilet paper and plunge my hand to clean inside but I put shit on my hands.

In my country I would just leave it dirty and leave but in japan I want to behave

by Fun-Two-3914