Someone in your family is going to be doing major grocery shopping very soon. There needs to be room for all that food, especially the perishables. Time to clean out the fridge & cabinets but especially the fridge. This is not the time to beat yourself up for the science experiment in the back of the fridge. It happens. Get out a new garbage bag & clean it all out. Then wash out all the containers. Then go through the freezer & get rid of all those old freezer burnt items that are taking up room. You are going to need room in there too!
Go through cabinets & rearrange so there is room for other non-perishable food items. Make space on the counter & clean it off really well so you are able to put things on there. Your kitchen may be crowded for a few days but I like to be able to see what I have & what I still need to pick up.