We have done away with spray-based solutions when servicing our trains as they contain solvents that have a negative impact on the environment and on people's health. One such commonly used substance is a brake cleaner – every year, we used to use about 7,000 containers of it at our depot for long distance trains at Rummelsburg in Berlin alone. But we've put a stop to that.
We have switched to refillable pump-action canisters that use a more ecologically sound cleaning agent. This eliminates about two metric tons of solvent every year just in Berlin.