The issue for some is that the denatured alcohol uses petroleum by products that are intended to make it taste bad, damage the body and leave a film, that's why they don't get a liquor tax. (not ideal for most who are trying to reduce the harm in their life). Really who doesn't have a spare ounce or Two of Vodka.
That is why you only buy the Isopropyl Alcohol, from the first aid section of a drug store, it is clear.. and only other ingrediant in it is purified water. Isopropyl has the great property of disolving oils, alkolids and resins... which means it will knock off just about any gunk a tank would come in contact with. You can find this in strengths from 70% to 99% at drug stores... myself I would recommend anything 90% or higher for your soaking needs. It is a clear liquid.
Dont soak most plastics or gaskets in it, but for everythign else it will work great.
"denatured alcohol" has mentholated components to it, and does leave a residue and is sometimes cut with petrol chemicals, but it is also often colored purple or green so you can easily identifiy it.
Anyways, no matter what you soak with... vodka, isopropyl, denture tabs... what ever.. you should still give every thing a quick rinse afterwards with some distilled water. Even a mild one with distilled water in a spray bottle will do the trick.