I was wanting to have a spare gallon of DEF in the pickup . I put the DEF in to a gallon mile jug. The DEF seeped through the plastic! My truck bed has a bed rug in it. The rug started growing some...
Not sure how best to clean it, but I would avoid carrying an extra jug in the truck to begin with, even the factory original container could get damaged and punctured accidentally and make a big mass.
We do a lot of driving on the trucks at my job... 20017 Ford with 102,000 miles 2017 Ram with 140,000 miles 2017 Ram with 55,000 miles None of them carry extra DEF, just top off when the gauge says less than half full