Drip tray under fridge…

Those drip trays behind fridges can be the cause of horrible smells! Instruction manuals with fridges never mention them. And as MayBee70 said, they are mostly not removable so very difficult to clean.
If you have a persistent bad smell in fridge area, pull out fridge and have a look!

I pulled out my cooker the other week, too. It’s always greasy underneath and behind it. I hate the thought of what’s behind the barge boards in my kitchen, too. I don’t understand the latest trend for no wall cupboards; I don’t see how the items can stay clean and foodstuffs on the shelves sometimes need to be kept somewhere cool and dark.

You certainly aren’t alone!
I’m often finding places I should have been cleaning for years, but haven’t!
I need a new element in one of my range ovens and dread to think what will be found behind it, when it’s pulled out!!