Bad enough that milk spilled inside the fridge but it appears (smells like) some has run down defrost hole at rear and into the tray where defrost water gathers. Yes the milk was not stored in the door! This tray appears virtually inaccessible with only a small gap allowing partial access and inadequate cleaning and that is only after extracting this beast of a fridge from its lair. After 18 years the tray appears to have plenty of crud in it now augmented by milk. Time and circumstances prevented me giving the tray the clean I would like to have given it. i was hoking about with a cloth on apiece of wire.The fridge had to go back. Is this tray removable or any more accessible by some other means even if the fridge has to come out again. Have thought of pouring a solution of some sodium bicarbonate down the defrost hole to counter the smell.