aphids on my large maple tree

Brigham City, UT(Zone 5b)

My large maple tree has aphids. lots of them. My father in law parks his car under the tree and gets sticky drops of ? on his car. I cut some branches off and all the leaves are sticky and aphids were all over them. What suggestions do you have for controlling them? I also have a large tree in the back yard that has the same stickiness. They are too large to force spray them. I have thought of using Bayer rose systemic on the ground. They are driving me nuts. Please help.
Marie

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