Sodium Percarbonate is one of the best choices for cleaning your home brew equipment (in the Barons humble opinion).
For the science buffs - its sodium carbonate reacted with hydrogen peroxide. For the home brewer - its a damn good cleaner.
To use mix 30g of sodium percarbonate powder with 9-10L of warm water. Let you equipment soak in the mixture for 10 mins before rinsing with warm water. It leaves no scent or off flavours.
Safe on copper, aluminium, and brass. Strong stain removal.