Worshipping ShivLingam with milk, honey, curd, water or bill patra is Abhishekam. "Shiva Agamas" The Sacred Literature Of Saivism, give lot of importance to abhishekam.

Worshipping ShivLingam with milk, honey, curd, water or bill patra is Abhishekam. "Shiva Agamas" The Sacred Literature Of Saivism, give lot of importance to abhishekam. You may perform Abhishekam by simply using holy water or perform elaborately with milk, curds, honey, ghee, sugar, coconut water, holy ash, sandal paste, fruit juice etc.‪ The Sanskrit word abhisheka means a sprinkling. It is derived from the root sic, to wet, and with the prefix abhi, "around," abhisheka is literally, "wetting around." Abhishekam is the offering of ablutions to an energised deity. Pouring water upon an energised deity releases powerful vibrations which we can pick up more easily than from the air. Similarly, different substances and each one has a unique quality which heals or energises a specific body part. Honey used in the Abhishekam has the capacity to actually make the voice sweeter. Water and milk are both liquids and water is connected to our human mind. When the moon is waxing and waning, it changes the quality of the water. And when the moon is waxing on its full moon night, there are huge waves seen on the ocean. And it has been found that this is the time when people who have mind problems go through a very rough time. If moon has such an effect upon water, then what to say about the human body which is 60% of water? When we shower the Shivalingam with water and milk, the reason is that symbolically we are trying to correlate the water and our mind and the symbol of Shivalingam into one. “Let my mind be washed away of all impurities”. Milk is considered to be the nourishing ingredient, pure and satvik, so the Mind is filled with Noble thoughts, goodness and compassion once you offer milk on Shivalingam. Bad karmas of many births are burnt away when you perform Abhishekam.
Om Namah Shivaya ~ Shivoham Shivoham!!