My dishwasher isn't doing a great job with glassware.
Either it leaves a rainbow-coloured sheen on the glasses, or a white film. Either way, they do not look clean.
I clean the machine regularly (every month) with Saino's dishwasher cleaner. I've tried adding rinse aid and even salt (though I live in an area where the manufacturer advises that I don't really need this).
I use top notch dishwasher tabs (Fairy Platinum).
Help!