Where is the EXP DATE ON THESE 1.3 GALLON JUGS OR HOW LONG DOES IT LAST,I HAD MINE FOR A COUPLE OF YEARS AND IT IS NOT AS STRONG ANYMORE.

Thank you for asking! Home Pest Plus Germ Killer would have a 5 year shelf life, as long as stored in a cool dry place. The lot code would indicate the manufacturing year. This would be stamped in black, on the blue plastic part of the bottle. Jordan