How to get rid of hard scale around the tap where the water comes out.

Soak the end of the tap overnight in HG limescale remover. In a plastic bag secured by a rubber band.

WD40 works.
In fact WD40 repairs most problems.

Nancy Birtwhistle recommends fixing half a used lemon to the tap with rubber bands and leaving overnight. It works!

HG limescale remover

I use a vinegar product.
I'm not at home at the moment to check the name, sorry.

A tip I picked up on GN a few years ago is to use a 2p coin to chip off the lime scale. It works well for things like taps, and does not cause damage to the surface.

Soak paper towel in white vinegar. Wrap it round the affected area and leave overnight. May have to repeat if the tap is heavily encrusted with limescale.

White vinegar.

I have found Viakal to be the best cleaning product for lime scale.

Tablespoon of bicarbonate of soda mixed to a thick paste with neat lemon juice. Baste it on the affected area, wrap a bit of cling film tightly round it and leave overnight. Rinse off and buff the next morning.