Here's the original poster's comments:

"Coffee makers used to be frustrating, because donation attendants just threw s*** in totes, and a lot of the coffee makers still had coffee in the filters. The totes would be drenched with water and sometimes coffee would be everywhere" (via PopSugar).

While Goodwill is happy to accept coffee makers, it would probably be best to drain your unit first before donating it. The same goes for removing the coffee filter and the grounds it contains. After all, employees are quickly bagging items, and they're not going to do a full inspection of that Mr. Coffee you just donated. They simply don't have time to do so — a typical Goodwill store will roll out over 2,000 new items onto the sales floor each day (via Goodwill). So imagine, then, with that volume of sellable items, the amount of items that aren't good enough to sell. You can see why your coffee maker might get tossed in with other items — like clothing — and make the entire tote wet, sloppy, and unsellable.

So the next time you're looking to donate some items to charity, make sure to go through each piece properly first and clean it well. That way, your items can make a bigger profit — and a bigger impact on your community.