This site has been a big help. We bought our larder fridge in 2010 for a fitted kitchen, so it is encased and immoveable.
All was going well until we had a milk spill in the fridge just two days before the hottest recorded day on record in July 2019 [38.6C].
A couple of days later a horrendous smell enveloped the kitchen. We live in the country and muck spreading was proceeding in the nearby fields so we put it down to that. The smell persisted even when outside air was fresh, so we did the same as others on this site and cleaned and bleached the kitchen with an intensive effort. Sewage pipes were checked for leaks and the cats litter tray purified.
Whilst cleaning above the fridge the smell was noted as being particularly foul - so the penny dropped!
The instructions leaflet for the fridge barely mentioned the drip tray at the back of the fridge, suggesting it could be cleaned regularly. However, the fitted kitchen made this impossible, without dismantling everything with high risk of damage and breakage.
We then thought of cleaning the drip tray in-situ, but how? The only thought was to syphon off the foul liquid through the drain channel in the fridge.
My plastic tube, previously used for home brew - was the perfect fit. With great trepidation, the syphoning commenced, remembering that the outlet had to be lower than the level of the drip tray. After several efforts, the dark smelly liquid appeared in the tube and exited into a bowl, via ones mouth - ouch!!
What to do next to destroy the infestation? Thick undiluted bleach was dripped into the drip-tray through the hole in the fridge - and we crossed our fingers. So far so good.
At least we now know the problem, as evidenced by all your experiences - so many thanks.
SyphonAl
August 2019