After the harvest, you will need to clean what you picked.
Greens especially need cleaning. They tend to be low to the ground, and when it rains (or you water your garden), bits of soil and mulch splash up and cling to the leaves.
Nobody wants to eat gritty, dirty greens.
Greens can be a bit tricky to clean up, but with practice you'll become more efficient. You'll enjoy your homegrown greens without any annoying...