I have seen several solutions which are supposed to clean mason bee
cocoons.
1) mason bees for sale dot com
solution of cold water and bleach. Use approximately 1 tablespoon for every cup of water.
2) davidsuzuki.org
five per cent oxygen bleach solution.
That is more that half a cup. Are you kidding !!!!
3) bentonswcd.org/time-clean-mason-bee-cocoons/bleach.
1-2 teaspoons of household bleach into 1 gallon of water
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The range of concentration between these sources is CRAZY. Personally, I would go with the
weakest solution which is number 3. Last fall I used a solution of 1 teaspoon in a gallon of water.
I could smell the bleach at that weak dilution. I cannot imagine what a tablespoon of bleach would do in a CUP of water !