Many people soak chicken in buttermilk overnight. The enzymes in the buttermilk help tenderize the chicken, and also give it little "tang".
Buttermilk
no
They may be unsafe to eat if left out overnight and should be thrown out.
does squash spoil if left overnight or two days
Buttermilk is the material left after the butter is churned out of cream. It is typically not pasteurized, so it could be said that it is made from raw milk. However, after the butter is churned, commercial buttermilk is pasteurized.
No. Buttermilk is a liquid which is left over when you churn cream to make butter. You can also make cultured buttermilk by adding a specific bacteria, Streptococcus lactis to milk.
No. It is not safe to eat turkey left out overnight in any container.
No, it may not be safe to eat after being left out overnight.
No. Stew left out overnight would not be safe to eat, covered or not - unless where it was left out was as cold as a refrigerator.
No.
It wouldn't be safe to eat salad that's been left out overnight.