Mulch.

Dan

I secon Dan. But still wind can stuff them with debries,
I would just cut them into two pieces lengthwise, separare the leaves an soak them in cold water. You will have to chop/dice them eventually anyway.

You'll never get rid of all the grit, but you can cut down on it a bit. In addition to the mulch suggestion, you might want to change how you set the seedlings out in the garden. For whatever reason, I get less gritty leeks if I dibble the seedlings in fairly deeply to begin with rather than simply planting them and then hilling later.

I did a search & they said to plant the leeks in a trench, but only cover the bottom half with soil, as the leek grows mulch with straw or hay like the "straw white potatoes".
Mulch like Dan said.
Another person said to hold up side down & shake loose dirt out of the leeks, before put them in the basket.
Also lay them in a pan of water or stopped sink of water so the dirt will loosen & float to the top of the water.
Much the way you clean greens.

Would like to ask what could cause the leafs to fall.
I planted some seeds indoor and they grow about 2-3in. and suddenly lost their leafs. Now they look like a thin, green stick.

Sorry if I'm in the wrong place.

Thank you all

Michael from IL