What is the best method to use to prevent the activities of the soulless alien Greys against humans? In particular, their experimentation with human DNA and their infiltration using clones and hybrids into the human societies?

This is a problem truly needing a divine solution. They have the upper hand here because their technology is so advanced. They can enter interdimensionally through the walls or ceiling of a human dwelling, to gain entrance, having arrived from a cloaked vessel that will be invisible to any outside human observers. They can immobilize all humans present and take anyone they desire with them, through the walls or ceiling, and up into a craft of some kind to do whatever they wish to do. The person will be powerless to resist. They may be consciously aware of everything going on but helpless to move and fight it in any fashion. This will result in tremendous trauma and this is very typical of those in the abduction program. There are a significant percentage, enough aware of all that has been done to them, that they are truly preyed-on victims and savagely victimized in having their free will usurped, having heinous things done to them against their will, against their morality, with little regard for them and their feelings. This is because the Greys, in particular, are lower-level beings. They are soulless, robotic beings. They can manipulate the thoughts and feelings of humans, if they choose, but may not choose to do much in the way of creating lack of sensation before an invasive procedure. It may be an oversight and, when noticed, may simply proceed because they do not care what the person is experiencing. So this is revealing the truth of these beings, their origin and their purpose, and the reason for their presence here. They were created by the blond, blue-eyed so-called Nordics, who are truly Arcturian in origin. They are soul based beings, but they are loveless beings, and this is because of their inner corruption of long standing, and why they can be so ruthless in exploiting another group of intelligent beings on the Earth for their own gain, and their own enjoyment in exhibiting their power. They have unleashed the Greys among you. You cannot counter this in any meaningful way. You cannot set up sensors or traps to catch them. They are too clever. They will disable all of your devices. They are able to go anywhere they choose with impunity. There is no defense against them. So you can only turn to the divine realm for any hope to have them removed from the scene and the grip they hold. They very much want to understand key things about humans and are using you as their laboratory animals. They will wish to continue this, but if you survive as a remnant of the human race and are solely living as a lab rat, you will not be happy, and the wounding you receive will only add to tremendous burdens from all previous lives with inadequate healing to fully recover from all that was done through the ages, by these very interlopers, affecting you directly, or indirectly, through the suppression of your world. This is not a prescription for a happy future. This is why the Divine Alliance, the partnering with Creator is critical. We require this, because this is a free will choice, and a test for you to rise above the suppression and see this in time, and to make the choice to realign once again with the divine force of love and light. That is all you need do, and is simpler than any other solution you could devise. You need not go to war with these beings. If you do, you will not last very long, and you cannot take them on in a physical confrontation. This is why the divine is needed. Their physics is so far ahead of yours, there is no contest.