Rob Cockerham was determined to make clear ice in his home refrigerator. It took him well over a dozen different tries and methods. Until:
Around this time, I spotted a crystal-clear ice sculpture of Optimus Prime on Reddit. I asked in the comments how they got the ice so clear and was sent a link to a video from the Science Channels‘ How it‘s Made. The video showed two steps that seemed worth trying: Using a pair of water pumps to keep the water circulating vigorously, and stopping the freeze process before all the water is frozen.
Determination. Also, he concludes:
In conclusion, WikiHow sucks and Instructibles is unreliable, but the rest of the internet holds great promise.
Now we know.