Mold growth on garden window!

Hi and thanks for the opportunity to get advice.
I need a way to stop mold from growing in my garden recessed window, on the North facing part of the house. As temps change, and condensation feeds the mold, it grows quickly.
Cleaning it is only temporary. Is there a better brand of cleaning agent to help it last longer and/or prevent the color change of the wood.
Thanks, and may the LORD give you a blessed, and healthy New Year to come.
A not too handy but, interested and always surprised viewer, Doreen

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