before you go and buy any fancy cleaning products try this.

give them a gentle scratch with your fingernail.

you may well find that the grey discolouration isn't due to faded plastic but is just a build up of general gunk

(sweat etc.

).

You should be able to get them back to shiny black if this is the case!

I was told this little trick by someone, thought it was a bit crazy but tried it out and it works!

So save your pennies and get scratchin'!