Originally Posted by
niftyshaving
Additional info....
"Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound,"
So while not calcium bicarbonate the point is correct that the sodium
replaces Ca and Mg making the soap scum soluble/ mobile and
the Ca and Mg boron compounds are more soluble so they
all rinse down the drain.
Baking soda (bicarbonate of soda) and common table
salt can also help mobilize the soap related deposits.
Prevention is important.... rinse well, shake to near dry and
then air dry.