What can I use to help clear sticky leaves on my Japanese maple?
Sticky Leaves on Japanese Maple
Certified GKH Gardening Expert
This can have many causes, and removing the film will only push off the infestation a few days. You will need to find out what insect is causing the issue, as this is the most common cause. When you identify the insect, and kill the infestation, the sap will clear on its own.
This collection of articles will offer broad spectrum solutions, but it is best to find the exact pest to know what treatments will be necessary: https://www.gardeningknowhow.com/special/organic/