By chance would the refrigerator be in the area where you are getting the Dirty Surroundings moodlet?
I've had it happen twice where the fridge glitches and gives that moodlet. A way you can tell is going into Build/Buy mode and try to move the fridge. It may say something like "Object is in use by so-and-so and cannot be picked up". If that's the case, you've found your culprit.
The only way to fix this that I've come across is to delete the object. You will have to have testingcheatsenabled turned on, then shift-click the object, click on Object, then Delete.
So far this has only happened to me with refrigerators, so I don't know if it's possible with other appliances as well. One time I had that Dirty Surroundings moodlet and somehow an old juice box had gotten stuck under one of the counters.
Hope that helps!