Tree sap removal

Its not tree sap. But a light brown stain from the leaves and such. I bet it is a acid or alky base stain. very hard to remove, I may have too get this buffed out this time and keep up on a good wax and sealer.

any recommendations for wax and sealer? and a good soap. we have a ARDEX truck that comes by, but I have never took the time to talk to the guy.
 
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