I've been doing this for about 6 months now, since I saw the tip on line somewhere. I had to try it out as soon as I saw it and have been doing it ever since. Works so well with strawberries, blueberries, grapes, cherry toms to name a few. Anything that you basically don't peel to eat, though I tried apples once but you can only fit about 3 in the basket so I didn't bother with doing them again. Plums would probably be good too but I think raspberries would be too delicate. It's supposed to wash off the wax and give them a better clean than doing it by hand.
fruit of choice (don't overfill the basket)
1 litre water (no more)
about 2 tsp white vinegar
Place water and vinegar into TM bowl. Place fruit into the internal steamer basket and set in place.
Wash 2 mins/speed 7. You don't need to put the MC in place (though I haven't tested it in the TM31) and it's quite fascinating to watch the force of the water washing over the fruit. (I know, little things and all that!
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Once done, rinse the fruit under running water then drain for a min or so before transferring to a clean tea towel and dabbing dry. I leave for about 10 mins or so until dry then I return the fruit to their little punnets. I find them the best way to store them as they allow air to circulate.
My strawberries were shiny and the little green leaves were standing up, the blueberries were shiny.
I found they lasted longer than when not washed.
If you have a punnet of strawberries or blueberries in your fridge, give it a try and see what you think.