Spotted by entrance to loos at Waterloo Station. My brief observations:
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Not 'by people of all genders', but 'by all genders'. Presumably, spectral genders swirl around the bowl.
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Not 'both genders' or 'different genders', but 'all genders'. Given the growing list, good luck with that.
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No punctuation. Could mean either 'don't be alarmed (that) these facilities are cleaned by all genders', or 'don't be alarmed (about anything in life) – these facilities are cleaned by all genders (so the world is a lovely place)'.