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It's the ducks that will be hugely tuned to UV because many birds use UV reflective markings for mate selection. Deer appear to be sensitive to it too....and particularity sensitive to the color...

I'm pretty sure sunscreen makes us glow with reflected UV too. A big issue for those nude hunters we know.

I use pure borax which is cheap on TradeMe. Same principle as the baking soda I'm guessing. Nothing fancy like scent or brighteners have been added. I tried washing in water only for a long time. ...