Blue toilet chemical leak

If it has soaked into porous material like the wood on the inside of the locker, I would think it next to impossible. I have spilt small amounts and have just left then to dry as I could not shift them. They don't show when the locker is closed.😀

If it has spilt and stained on the outside of the door, drywash might work. I always found that very good at removing stains on our old van, without damaging the surface. It will depend on what the locker door is made of, some plastics seem particularly susceptible to staining.  

There's 2 threads running. This one and one in general chat 😂😂.

One of the reasons I stopped using blue was the terrible staining effects it has. I have changed to bio pods .