Oh dear, ive fallen foul to Viakal myself and its lethal. Can only suggest maybe a cream cleaner with soft cloth or I find cilit bang is great on anything. For a shine you could try window cleaner spray - brings most surfaces up shiny
Depends what its been painted with - if its emulsion then a good scrub with water and some product like cilit bang should remove it but if not then its gonna be a paint scrapper
CAN YOU BUY AN EXTENSION PIECE FOR THE SHOWER PIPES BEHIKND A TILED WALL AS THEY DONT REACH OUT FAR ENOUGH NOW CAUSE THE TILES ARE15MM THICK AND THE FRONT PLATE AND TAPS DONT REACH
We have fitted a Moretti shower and the 2 pipes that come through the wall dont reach out fa enough as we have marble tiles 15mm thick around the shower. Is there any extension we can buy for the pipework so that the fittings are accessible