Solopressure washer
New member
Mr help full. What is the shelf life of f9 unopened and open. I had 1/4 of a gallon left over straight product, and a week later I had white crystals on the bottom of the jug, almost like something was falling out of solution. I did have it sealed with the cap and it was in the back of my truck for that time. I did have more and did the job and as always it turned out great. They were the same batch # on all the jugs I have bought that is the reason for this question. Thanks in advance.