I think sanding would ba a *last* resort
First, try "soaking" with a solution of a water based all purpose cleaner, properly diluted, on a cool surface, in the SHADE!
Let it soak for at least 5 to 10 minutes, keeping it wet with the solution, don't go playing "rubby dub" or you might created some serious scratching,etc, which then makes more work.
If, after it sets and you have wiped it off and washed off with plain water, they are still there, move to the next step.
Since most "grease/wax/tar" removers contain a fairly high percentage of xylene in them, do not recommend their use except when preparing a vehicle for sanding and repainting..
Honestly, the safest hydrocarbon remover you can use is naptha, used in many of the polishing and waxes used on vehicles, just under a different CAS#. Soak and let set, then wipe with a towel wetted with the naptha.
Where do you get naptha, simple, it is "lighter fluid" and will do nothing more than remove any wax or sealant on the clear.
Another, is plain old "rubbing alcohol".
It will not harm your finsh, just use it the same way, "LET IT SOAK", DON'T GO GETTING ALL IN A HURRY AND RUBBY DUBBING!
If none of these work, it may be from pine type trees that are emitting turpene and if so terpentine can be used.
If not .. move on to clay. You may get some scratching with clay, so be prepared to do some polishing after using it.
