It all depends on the type of fruit and where it came from. Wild blackberries should always be washed, but those sold by supermarkets and greengrocers are cultivated varieties and should not need any washing. Do not wash raspberries, boysenberries or loganberries as this will spoil their juicy texture. Strawberries, too, should not be washed, unless they are particularly dusty. Blackcurrants, gooseberries, redcurrants and whitecurrants should be put into a colander and rinsed under a gentle running tap.
** Asian Recipes