Cleaning the office fridge - the stuff nightmares are made of. 
You could post notices in letters a foot high, send e-mails every day for a month, put fliers on everyone's desk, wait until dark oh-thirty on a Friday night, and someone will come to you and and pitch a hissy about you tossing their (fill in the blank).
It's a thankless task, but someone has to be the scapegoat do it.
I love your reply, BarensMom! I think you are right,
however you announce it, some special snowflake is going to complain.
Two quick stories to share:
1.) At my last office, once our breakroom refrigerator was cleaned out with five days notice to us all. I forgot that I left a brown paper sack in there with two fresh apples and my
good paring knife. I didn't think of it until I was halfway home that night.
Did I have a hissy fit about losing my apples and my good knife?
No, I realized that I had been warned and it was my own responsibility that it slipped my mind. (Hey - I'm
not a snowflake, at least about refrigerators!)

2.) About notifying people until you are blue in the face, and they'll still complain:
Almost 30 years ago I was a teacher for several years. I remember the teacher ("Jane") whose room was next to mine came in one afternoon after school and said she just had to tell someone what just happened because she couldn't believe it.
A mother had come in for a conference and was very upset because Jane had given the woman's son an F in English with, the woman complained, "absolutely no warning". She complained, if only Jane had told the woman and her husband that Junior was failing, they would have helped Junior do better in Jane's class.
Jane said to me, But Snappy, I did tell them! Over and over again!"
Jane pulled out her file folder about Junior and showed the woman where Jane had sent home a "completed work" folder
every Tuesday for the whole marking period.
Every week, the woman or her husband had signed and dated the folder page where it said that they had reviewed Junior's work and grades - and where Jane had documented Junior's grades each week. Jane had also noted in her file that she had called home twice and had spoken with Junior's father each time about Junior's progress.
Junior's mother's comment to Jane? "Oh that? We didn't think you were serious!"