Yep. I use a 2 gal bucket half full of water to put harvested leafy greens in as well. Sometimes water that sat overnight in the bucket is colder than the water from the outside spigot. Overnight water is sometimes dusty with pollen and sometimes little gnats or fallen in spider, ants, etc. but it really doesn't matter since the first dunk floats off some aphids, slugs, and soil from the leaves anyhow.
I noticed that if I don't pay attention and leave the bucket in the sun, the greens that are not submerged wilt, and if I forget and the sun warms up the bucket water, same thing.
So I leave the bucket with greens in the shade, and then take it back to the outside spigot or hose, run water out of them -- especially the hose can be holding scalding hot water -- then use the cool water to gently fill the bucket to the top and allow to overflow for the floating debris to spill over, dunking the leaves gently. Then I lift the leaves a small handful at a time into a second bucket in which I have water swirling in. The first bucket has surprising amount of junk in it. This gets dumped out while the second bucket fills and the swirling water washes the leaves. During this process, any undesirable leaves or portions of leaves are removed.
If you are doing this at a remote site, maybe take water-filled bottles and frozen water-filled bottles to chill the water with.
I repeat one more time -- sometimes I STILL find slugs or cabbageworms that had been hiding somewhere in this final rinse bucket -- then lift the leaves into a colander. That's my outside wash. After they are brought inside, they get processed some more for storage in the fridge.
For big harvest, I use bigger buckets or sometimes big storage tubs.
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