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A little salt, a few spices, you could pickle yourself.
Where do you get 5 gallons of vinegar?
The big box stores. If you do this, i would think you will want to rinse them with water a lot afterwards, vinegar could drive the PH way down.
filter cleaners are very acidic, probably more so than vinegar. I don't see any difference here. As for the smell. vinegar washes out of just about anything very easily. I just have found that vinegar works better as a general purpose cleaner than most all of the bottled cleaners.txwillie
You just need to be honest about it. You want to use vinegar to save a buck, not because it works better.