I am currently at my mum's in a hard water area (Where I grew up). I much prefer the drinking water here I have to say! Mum has a separate small tap on the sink that runs soft water & she uses that for cooking but it doesn't treat the bathroom plumbing unfortunately. I too have to wipe down the walls and shower screen BEFORE I get out of the shower which can be a chilly job!!
Sounds like you should take professional advice about your tiles and how to treat them safely OP and maybe invest in a softener if you can afford to ?
a note of caution if you use mouth wash
Petition to stop the EARLY RELEASE for PC Harpers killers


