i live in bournemouth(5 miles from anyway)do i need to add salt to the dishwasher aswell as using finish 5 in 1 cause it doesnt seem to be cleaning properly i have cleaned it out and used one of those dishwasher cleaners and i dont over load it the water hardness system to work it out is like a forien language to me i dont wanna have to wash up by hand i live in a faily hard water area but cant work out exactly how hard help!!