Smelling of mould

A couple of things you could try:

Fill the empty case with crumpled newspaper (works in fridges that have been in storage)

Fill with a fullers earth based cat litter.

The outer part of the case seems to be fabric covered? If so, sprinkle with ordinary soda crystals, (which these days are more like powder) leave for a couple of days and vacuum off.

Good luck!

Bicarbonate of soda supposedly eliminates odours.

Dilute soda crystals will get rid of any smell- I used it on a dustbin a fox had sprayed.

Spray it with Febreze air freshener. It’s supposed to remove smells, not mask them.

Oh, it took a number of repeat sprays to finally banish the smell.

When I spilled a pack of milk in the back of the car, despite scrubbing and soaking and mopping the smell of sour milk was pervasive, so when the boot carpet had dried I sprayed it with Neutrdol carpet smell neutraliser.

I have had a quick look online. It is available from allgood supermarkets, Wilco and Pound Stretcher. It was many years ago, but we bought it in Halfords.