Just that. I wash grapes quite thoroughly before I eat them. I take them off the stalks and rub a handful in my hands under the tap to clean them before I eat them.
I find just rinsing them under the tap to be insufficient.
And I know some people would just eat them without washing them at all, which I find odd and a bit gross.
I am pregnant now so extra careful but I have always tried to wash certain fruits and veg thoroughly anyway