Another vote for a soft toothbrush & some detergent; be gentle though, you don’t want to damage the sealant.
You’re probably stuck with the fridge shelves if a good rub with an anti bac wipe doesn’t do anything. No one looks there anyway, as long as it’s clean.
If the shelves are beyond a clean up you could try spraying them with PlastiKote spray 'paint' which will build up a thick layer if done gradually. The acrylic version was what I was thinking of.
------------- 'A sure cure for sea-sickness is to sit under a tree'
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets