Hello, My dad has alzheimer's and is taking a drug (don't know the name of it) that makes his wee go blue. Blue wee isn't the problem, but the fact that as he is ill and (without sounding too crude), his aim isnt as it was so around every toilet there is this blue stuff where he's missed the loo. It wouldnt bother my mum so much, but it just doesn't wipe off. Mum has had to replace all the carpets with lino, but the walls are just ruined. Has anyone else has this problem? And what removes the blue stain? And is this drug really doing anything anyway?