Reading through the Discovery Owners forum I came across this .......

Linky

Looks like an even cheaper option to the electrolysis method. Never tried it myself but the results look good.

Already well discussed and tested on this forum.

Still, it is good to have a series of photo's like that.

Yeah its an alright set of photos isnt it.
- Ive always figured i should give it a go, but never have.