Very old bottle of DP 4in1 Rinse less Wash still safe to use?

[critical_level2]

Around 2-3 years ago, I bought a gallon bottle of DP 4-in-1 rinseless wash. Over the last 2 years due to work, moving to a new house, etc., it got put on a shelf and hasn't been touched. It doesn't matter to me if I have to buy a new bottle, but I would rather not waste the old one if it is still safely usable. Would it still be okay to safely use it on my new truck after sitting for a few years or would it be better just to toss it in the trash and buy a new bottle of it? Is there a certain shelf life to the rinse less washes?



All help is appreciated.

 

[fmodena]

Open it up and make sure it doesn't smell rancid and check for any mold on the inside.

I have about a 1/4 gallon of the same that is at least 4 year old. Mine still smell/works fine.

I use it as rinseless, at QD strength for bird bombs and add it to regular car wash soap/water.

I think yours will be fine to use.