On 7/24/2015 2:45 PM, Muggles wrote:

I don't want to damage anything accidentally by using an acid, but if
that's the only think that'll work, what would be the safest one to try
first?


Before you rent a jack hammer from McLowesDepotBigBoxMart, maybe try some vinegar.

http://www.thechemicalblog.co.uk/how...as-a-descaler/