P
Philip Birch
Freed a shower valve with Viakal but paid the price - a nasty white etching of the Travertine from the valve to the floor and a patch on the floor. Finally got rid of it by sanding with 180 paper then used a product I'd bought some years earlier called Akemi Colour intensifier, a clear liquid which give stone a permanent wet look. Surprisingly good result - could not see where the etching had been afterwards.
