Our House Wrens have fledged. Their nest has been removed and the nest box cleaned. I scrapped as much debris and dust as I could from the nest box and sprayed the interior with a bleach-water mix to kill any lingering insects (bird mites mostly). I also rubbed the inside of the house with Ivory soap, especially the top and upper sides, so that the wood will be less hospitable for wasps to build their nests. Hopefully, soon, we will have another inhabitant in our nest box.