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Onion
Under your bed.
3
Onion is what goes bad in the potatoe salad because it attracks bacteria. If you use mayo that is home made then that can go bad but the commercial mayo has preservatives in it. If you put an onion out on the counter when someone is sick and let it there over night you will see how it attracks the bacteria.
A potato gone bad. Garbage. Wasted money.
I doubt it...
Yes you can, it would not be a good idea though because mayo goes bad when it gets warm, and also it would not taste that good I would think.
no
You can tell if tuna salad is bad by the way it smells, tastes, and looks. Tuna mixed with mayonnaise usually will not last for more than a couple of days.
It could be eggs that have been added to the salads, because eggs can go bad quickly.
Potato salad will never be as good as when it was first made. Use it within a day or two. Depending on what you put in your potato salad will depend on how long your salad will last. If you put eggs in your salad then you have 3 days to use it up in. If you omit the eggs then you have about 5 days as long as the salad doesn't sit out and get warm since it has mayonnaise in it.
It will F@#! your car up real bad.