Using five cups of water, all salted in the process of blessing, except one control cup which was not blessed.
Using a Sumerian blessing of water ritual
Using a Latin Catholic blessing of water ritual
Using a Wiccan blessing of water ritual
Using a Protestant blessing of water ritual
Using a cup of un-blessed water for control
Using a summoning/binding/commanding spell from the Lesser Key of Solomon for a specific demon to touch an object, without manifesting or presenting itself, but imbuing the object with a touch of its own essence for the duration of the experiment. (A special note should be made here that a demon that hates -all- water was purposefully chosen.)
The results were as follows:
The object in question, when dipped in the un-blessed water, came out almost entirely dry, with a cumulative total of approximately two to three drops of water remaining on its surface.
When dipped in Wiccan water, the water beaded and rolled, slipping around and falling off the object almost immediately.
When dipped in Protestant water, the water slid off in almost exactly the way of the un-blessed water, but clung for a few seconds longer.
When dipped in Sumerian water, the water immediately spread covering the whole of the object, without falling off at all.
When dipped in Latin Catholic water, the water also spread, covering most of the object, with only a modicum of water loss.
Sumerian and Catholic holy water had the most unnatural reaction upon interaction with the demon-touched object.
Sumerian and Catholic holy water had an enveloping and barrier forming reaction upon interaction with the demon-touched object.
Wiccan water was almost forcibly expelled from the demon-touched object.
Protestant water produced the least reaction and the most normal one.
Therefore, Sumerian and Catholic holy water are the most effective with regard to the uses and purposes of holy water in interactions with powerful demons.
Note: The Sumerian holy water seems to have had the strongest reaction. This may be because the demon in question was Persian in origin from ancient times dating back to early Zoroastrianism.