I've had my quartz worktops for over 2 years and I still love them but they've lost that lovely shiny gleam they had when new. On the advice of the installer, I use a lukewarm water spray with a drop of washing up liquid in it for day to day cleaning, then clean with Cif cream once a week. Can anyone advise me on how they keep their quartz surfaces shiny? (NB not granite - apparently they react to cleaning products differently!)