There's some water left in the cooked potatoes that emerges as they cool. One technique I learned is to drain cooked potatoes from boiling water and then return them to the empty pot on the stove for a few minutes. This extra heat helps remove some of the water left in the potatoes. Then remove them to a bowl and add dressing and other vegetables you may want in your potato salad. On greens, same thing. Water still in them exudes when sitting. So wash & spin them in a salad spinner or wrapped in a clean dish towel. But don't dress it if you plan to use it over several days. Rather, chill prepared greens covered & naked in fridge and add dressing just before serving.
PS Another cause of water jn the salads left to sit a day or two in the fridge (aside from water left in the vegetables) is the salt in the dressing. It draws water out. So maybe use a dressing without salt and see if the wateriness disappears or reduces. Then add salt at table or just before serving.
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This extra heat helps remove some of the water left in the potatoes.
Then remove them to a bowl and add dressing and other vegetables you may want in your potato salad.
On greens, same thing. Water still in them exudes when sitting. So wash & spin them in a salad spinner or wrapped in a clean dish towel. But don't dress it if you plan to use it over several days. Rather, chill prepared greens covered & naked in fridge and add dressing just before serving.
So maybe use a dressing without salt and see if the wateriness disappears or reduces. Then add salt at table or just before serving.