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If I remember correctly, molasses is slightly acidic. Could that be the agent?
My first impression was "lettuce have light."It is beautiful.
I clean our sports bottles with a dilute bleach solution. I usually bleach them in series by pouring the solution from one bottle to the next.I clean the straws by placing them in the bottle that I am bleaching. I place them in one way, then turn them over to bleach the other end. I like the accordion shaped straws and the bleach does a lovely job on them. Eons ago, I got a small diameter, long length brush made jus for cleaning sports bottle straws. I have no idea if you could still get one.