Grocery bag with a spray bottle, spatula, half-used bottle of Windex, half-used bottle of Spic-and-Span, small hand broom that fits into its dustpan

Isn't this the bag of stuff that you buy when you are moving into your first solo apartment and suddenly realize that your roommates at the last place have all the cleaning supplies?  So off you go to spend some time in the cleaning supplies aisle of the grocery store, trying to figure out what you'll need. 

How does something like this show up on the free bench?  Once you have cleaning supplies, don't you need them and use them until they're used up?  Which would mean you wouldn't have them to leave on the free bench.  If you do leave them on the free bench, where are you going?  Not to another apartment, because you'd need cleaning supplies there, too.  Are you going to a commune or a monastery where they have brand loyalty for some other brand?  Are you going somewhere that has specific ideas about cleaning supplies: "We only use lavender water and tea tree oil to clean with"?  And so rather than throwing them away, you leave them for someone who doesn't know that lavender water and tea tree oil are the only true cleaning supplies. 

Maybe someone will happen by who is walking the streets, stricken because they have just moved and have no Bon Amie.  This bag will be the mother lode.  And the spatula is a bonus, a house-warming present.  Clean up your space, and then make pancakes.