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Fine. Tell people that the maids are getting so many 'goods' that they can't use them all. Tell people that their donations are better served at charitable organisations. But telling people that service staff mock them behind their backs when they give them gifts doesn't encourage them to give CUCs instead. It encourages them to give nothing. The type of person who responds to the kindness of strangers with derision, regardless of how misguided that kindness is, frankly doesn't deserve anything.
Anyway, we typically give our 'gifts' to local hospitals and schools. We also tend to ask hotel staff that we talk to on a regular basis (the woman who serves me breakfast every morning) what they would like us to bring them the next time we visit.