Hola Anónimo(a),
Otra opción con "the magic word" incluida.
Buena suerte y saludos cordiales del Oso ¶:^)

please=por favor
do not litter=no tire basura

Otra opcion

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Note added at 2002-10-21 17:53:46 (GMT)
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A bit off-topic, but only a bit: When I was a little kid in school, we were taught a corny old rhyme (they don\'t teach things like this any more, they are so obsessed with a different kind of accountability that has to do with numbers, money and politics). I only mention it because it occurs to me that we should consider dipping back into some learning techniques that last for I refuse to say how damn many years. ;-)

A bunch of golden keys is mine
To make each day with gladness shine.
Good Morning---that\'s the Golden Key
That unlocks each new day for me.
And when to rest, Good Night I say,
And close the door of each glad day.
When at the table, If You Please,
I take from off my bunch of keys.
Excuse Me---Beg Your Pardon, too,
When by mistake some harm I do.
Hearts, like doors, will ope with ease,
Through very, very little keys,
And don\'t forget that two of these,
Are Thank You, Sir, and If You Please.
Upon a golden ring these keys I bind,
This is the motto--\'Be Ye Kind\'.

espero te sirva

En Argentina, especialmente en Buenos Aires, proliferan los carteles en las plazas y lugares públicos que suelen decir "A este lugar lo cuidamos entre todos" "A este lugar lo cuidan la Municipalidad y usted"... "Mantenga limpio, por favor".
La palabra "basura" solo se incluye en los carteles que dicen "Prohibido arrojar basura. Multa: $..."