As a single bloke, I think a total fridge clean was a rare thing. Maybe annual, I really don't remember. But a little story of fridges....
For ages, I copped the blame for the fridge needing a defrost. My misses would claim I wasn't closing the fridge door properly causing the ice box thing to chock up with ice. It happened a number of times and was of course never her "fault". She was insistant she'd never do that, she always checked. I'm pretty laid back as a rule about 'shit happens' stuff but, tbh, I'd even begun to doubt myself. I'd started to make double sure I was closing it properly. Then I noticed...
We have a dish washer next to the fridge. On rare occasions, when opening the dish washer door it would somehow catch the fridge door just enough for it to partially open. Not always but sometimes, and I still haven't worked exactly how, but I saw it happen - when the misses opened the dish washer. I pointed it out immediately, "check the fridge door, I think it's opened". Sure enough, it had. Have I ever had an acknowledgement, let alone an apology? Have I **** as like.
Then quite recently we were watching some TV program. On it, they had a fridge beside a staircase. When someone came down the staircase, the fridge door would open. The wife would say nothing but get up and close it again. See, I said to silence, weird shit can happen.