Keeping squirrels off a porch railing

Gray Eastern Squirrels (live in Boston) use the porch railing to climb to the awning and onto the roof - where they chew through siding. Is there a product or contraption that would deter them from the railing (made of PVC)? Thinking of using bird seed to re-route the squirrels to another part of the yard. But not sure if the squirrels will take this and bring it to the roof where they may be trying to create a nest? UGH
q keeping squirrels off a porch railing
The wooden sticks on the top railing are a contraption I made to prevent access--doesn't work. I even put Vaseline on the siding beside the top railing going up to the awning - doesn't work.
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