I hope you're not going to start a cleaning product of the day photo as well?Really mundane but I use 'magic sponge' here at my friend's house to get rid of marks in cups. He hasn't got a dishwasher! At home I find that the dishwasher keeps all the mugs sparkly clean. The magic sponge contains no chemicals whatsoever and works by micro-abrasion. It works on all sorts of other marks as well. You can buy this well known brand but can get similar on Amazon cheaper. You cut small pieces of the sponge off as required. It really does work like magic...
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