Join Date: Dec 2009
Location: Bangor ME, Berkeley, CA
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Re: Remove dried salt from porthole glass
Mild acids like the acetic acid in vinegar should be good for removing residual calcium carbonate, but there are more aggressive products you can buy in a hardware store for removing lime scale that may work better. Before you try one of them I would try to increase the contact time by soaking a cloth in vinegar and securing it against the window for a while. Increasing the temperature will also increase the rate of reaction, moderate warming might help the process along.