I am going to look and read about it coz i was too young that time and my teachers tell me that the thing began from overseas and during the 90s the VHP and other splinter organsitaion together with the BJP were asserting,it was also the period when there was HIndu revivalism: it was assertion of belief and a scientific explanation was overlooked to make it appear as a miracle.
Lord Ganeshji is always offered ladoos and not milk, there is no mention in the scriptures that Ganeshji performs miracles. He did had couple of tricks which is a myth or myths for his mother or godly pranks.
Why would God perform Miracles,he does not have to prove himself?