And be careful about your supplier if you buy locally.

I bought a small bottle of KLN at my local hydroponics store and at home discovered it was expired. When I returned it, the owner was very apologetic and said he'd make a fuss with his supplier. Next weekend, he had a sparkling clean row of KLN bottles with no expiration dates. I passed, and when I mentioned it to my wife at home, she said that a wipe down with rubbing alcohol will take that print right off. She said she discovered it while cleaning new medical supplies when they come into the office.

Cheers.
Jim