Clean out unused box?

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Julian
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Clean out unused box?

Is it recommended to clean out a nest box even if no birds nested in it?  I have not been replacing the wood chips in boxes that were not used, even if the chips have been in the box for a few years.  I guess the chips could get pretty moldy after seasons of rain and snow.  In my limited experience, kestrels have not nested in boxes that went unused in previous nesting season(s).  Should I be replacing the unused chips?

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