An automated use of CO2 snow blasters can easily be implemented. The equipment can be configured either to operate in synchronization or continuously. The use of flat nozzles makes surface processing very effective. When pre-treating plastic surfaces, a CO2 snow blasting nozzle can even clean several square metres per minute. Any number of nozzles can be integrated into an automated CO2 snow blasting system. Depending on the process control, the nozzles are controlled either together or separately.