Milk is very good conductor of positive energy. Milk of Indian cow when poured on idol reciting mantras strengthens mind, body and inner consciousness of a person. Milk is gift of Bhagwan to us, trees, food, air …infact everything is given by Bhagwan. When we all took birth, we all were naked…what did we bought to this world, what is our contribution to keep this world running…. nothing….because we all are negligible, we are staying alive at the mercy of Bhagwan. Who are we to question that pouring milk on Shiv Lingams is wastage of milk and instead should be feed to poor people. Are we owning the milk, trees, places, earth or anything offered for free by Bhagwan. No … then who gave us right to only question Vedic values which are based on scientifically driven principles. And not question on evil practices of other religion, whose evil anti-Vedic god likes to feed on the blood of innocent goats, cows, camels and buffalos – wherein till date billions of innocent animals are killed just to appease this anti-God satan – killing animals is more evil or pouring milk on Shiv Lingams. Think over it; its easy to bash our core Hindu values which is based on Dharma but very hard to rebut with same vigour about other adharmis because they are very violent and likes terrorism. The moment we start respecting our traditional values and become aggressive. All these satanic people and their terrorism will cease to exist.
And moreover the poured milk is NEVER wasted, it is used as charna amrit and the positive energy filled milk is redistributed among devotees as prasadam. In fact we all should be ashamed of the fact that few of our Hindu brothers and sisters do not pour pure milk but mix it with water to dilute the positive impact of the puja. We should completely trust our great culture which is into existence since time immemorial
When milk is poured on the idol (milk abhishek) the flow of positive energy starts getting accumulated towards idol so a person who is devotee when is closer to the idol he accepts the flow of positive energy into his body.