If you've paid $6 for a punnett of fresh berries, it's really annoying to look in the fridge the next day and find fuzzy mould growing on them. Here’s a tip worth sharing on how to keep them fresh: 

Wash them with vinegar.      When you get your berries home, prepare a mixture of one part vinegar (white or apple cider probably work best)and ten parts water.  (1/10) Dump the berries into the mixture and swirl around. Drain, rinse if you want (mixture is so diluted you can't taste the vinegar,) and pop in the fridge.  The vinegar kills any mould spores and other bacteria that might be on the surface of the fruit, and voila!  Raspberries will last a week or more, and strawberries go almost two weeks without getting mouldy and soft.