Black spots in the kitchen sink

Another route for day to day cleaning is vinegar. I use a spray bottle with half white vinegar and half water at night on my counter tops before bed. (Use soap after cooking or prepping.)

The vinegar does a good job cleaning bacteria, mold, and germs. Once you get accustomed to the smell of vinegar, you will realize it deodorizes after the vinegar smell goes away.

A nice touch is rubbing a lemon on the counter beforehand, but it really doesn't do much other than smell nice and break down oil.

According to http://www.eggsafety.org/consumers/consumer-faqs, black or green spots inside the egg are the result of bacterial or fungal contamination of the egg.

The use by date is only an estimate, so if your eggs are moldy, I'd bin them.