Can ice melt go bad?

I have ice melt that I have kept on the back deck in an empty joint compound plastic bucket. It had a lid.
Well, after about 2 years the lid broke and the bucket got full of water. I just kind of ignored it.
Well, we have ice so I grabbed the bucket and a metal spade and began spreading the last of the ice melt…and it doesn’t seem to be doing any thing.
Did I kill my ice melt?
Am I an ICE MELT MURDERER???