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Explanation: A "servante" or "servante d'atelier" is a pice of furniture used to contain tools, accessories, or in this case probably the tank supposed to receive the cleaning agent and the residues of the cleaning.
If the "roller" may be self-implied, perhaps "cleaning cabinet" is enough.
Below references with a "servante d'atelier" or "roller cabinet", then a manufacturer of cleaning machines with a cleaning cabinet