Hi you all probably know this.
But I had v.good results; I soaked kitchen paper towel in very strong colourless vingear (cheap in supermarkets e.g. pickling, distilled) wrapped them around the tap's spout and around where the tap sits on the sink/bath. Covered the wet paper with cling film to stop it drying out and left it for many hours.
You can then just scrub off all the gunk, makes it look if you the taps are new and you have just installed them.
Was thinking of getting some new taps - no need now.
I don't think its wise to use that brown malt vinegar - might stain