Not just a washing machine (see other post), but also a dishwasher!
Having not had one for twenty years, except the odd stay on holiday, I am completely out of touch with the best and most economical detergent and rinse aid. I don't even know whether it is better to use dispensed rinse aid or rely on the seemingly impossibly complicated combination tablets.
The dishwasher is an ordinary slimline one - so using tablets formulated and sized for a full size machine feels wasteful.