My parents have asked me to have a look at their shower mixer. It is a plain gravity hot feed,mains cold mixer, 1 lever for pressure, and the other lever for mixing. Both levers are getting a little stiff - probably limescale build up on the threads, so when took apart will (hopefully) just need a good clean.
I can see no easy way of getting it apart to clean it - do they have to be taken off the wall before they can be disassembled?
Any other things to look out for? Thanks Alan.