water and bleach solution to clean mason bees (3 wildly different opinions)

 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 !