So I spent the weekend battling this horrible odor in my fridge. First I thought it was some old ground turkey that I found in there. Threw it out. Smell was still there - worse - the next day. Then I found a rotting cucumber in a bag where rotting cucumber juice was slushing around. Nasty. But the smell remained long after I tossed it. Blah blah blah. Long story short, I gave the fridge a good cleaning top to bottom. Found a couple of ancient sour cream containers, including one that had tumbled over and leaked nastiness down the back wall that I think was the primary culprit of the odor. Even after that, though, the smell still sort of lingered. From what I can tell, the sour cream spillage - or perhaps some rancid cucumber juice - seemed to pool around the hole in back where the water line comes in. There was a hunk of silicone caulk filling the hole, and I took it out and cleaned it good, but the caulk was holding the smell. I even soaked it in white vinegar for a few hours, and it wouldn't lose the smell. So I chucked out the glob of caulk. The smell is gone from the fridge, but now I have an uninsulated hole where the water lines come in. I stuffed some a rag in there as a stopgap, which leads me to my question: Is there any harm in making the rag a permanent fix? Will it do a good enough job keeping warm air out? I'm guessing that was the purpose of the glob of caulk. I could recaulk it, but from what I read online you have to take everything out of the fridge, shut it down and then let it air for 24-48 hours. That doesn't interest me. I was also wondering if a shot of spray foam would work or if that might constrict the water line when it expanded. Any thoughts on the easiest way to deal with this?