3 or 4 times a year, I am forced to pull out miles of vines around my house in Florida. (man they grow fast) I can usually see the "hand prints" from the last pull out but never the one from the prevoise, so I know they eventually disappear. I think they dry out after time then rot making them disappear. I suspect pressure spraying may work. It may take several tries for the fresh ones. You may have to wait awhile after you rip them out and you paint. Painting over them doesn't sound like an option.