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Thank you so much, my neighbour had to uplift one of the floor boards under the freezer and guess what he found? The remains of several mice, he sprayed the cleared area with Domestos Bleach.
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I will ask a neighbour to do as you advise (I am 80 living alone) and will let you know the results.
Thank you for your assistance.

We have an awful musty smell from behind out freezer, any assistance/advice please