Whilst showering,avoid the temptation to dump in the shower tray. Thinking that the water will wash it away does not work.You will have to break it up with your feet,and also use your feet to clean the tray. You will also have to explain to your very surprised and shocked wife just what the feck is going on. On the upside,the wife will not speak to you since 08.38 this morning. Not that this has ever happened to me.