I have and started looking for answers...
• 1 part regular dishwashing soap with 4 parts water;
• ¼ cup corn syrup or glycerin « the secret ingredient.
As bubble makers, you can use 100% cotton string with 2 plastic elbow straws or any plastic object that can hold a film.
For more info check this page: How to make Giant Bubbles.
It has lots of info and tips about how to make giant soap bubbles.
*The image above belongs to Arnold Kiffen (~twphotography).
You might also like the Samsam Bubbleman's video bellow, he makes spectacular soap bubbles.