I have some VERY OLD commercial cleaning products- r they dangerous?

that I need to throw away. Old, like 20 yrs! I'm cleaning out my garage and finding some stuff I had no idea was there!!! I want to recycle the plastic containers they're in so I need to dump the liquid products. Some are just things that clean and two are degreasers. Will it hurt anything if I just pour them out in a pine island I have?
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