Franke Consumer Products FF-2000 - Manual (Page 8)

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General maintenance
Clean aerator periodically.
Do not use harsh detergents, solvents, chemical agents, steel wool, etc. that could harm
the surface.
Clean only with a soft sponge and soapy water.
In the case of very hard water, it is necessary to clean and dry the faucet after each use.
Calcium deposits could damage the surface.