How do you care for your gut? share with nairn's - £ voucher to be won! Plumbers, gasfitters and drainlayers need to be. You were a life saver (or actually, a $-drain-cleaning saver) tried the hot water/salt first but it didn't seem to do much so i tried the baking soda/vinegar and, amazingly, the sink started draining! thank you so much for posting this! Old boilers can become less efficient costing more to run and maintain with problems that can.