Recently, me and my mom parked her car in a spot reserved for customers of a super expensive shoe store while going to get some also fairly expensive drinks at Starbucks. When we came back, an employee at the shoe store put a sticker on my mom's window warning us he could have us towed and ticketed. Clearly they're bitter about having no customers. This sticker left a whole bunch of sticky residue on the window.
I knew from experience that water wouldn't get the job done, so I put some canola oil on a paper towel and sure enough the sticky residue dissolved into the oil and I could see it dissolved in the liquid on the paper towel.
This got me thinking. Is it generally true that a sticky substance will be nonpolar? Furthermore, is there a generalization which can be made about structures which are sticky on a macroscopic level?
My only guess is that sticky substances are usually viscous too which leads me to believe that there must be a lot of VDW/dispersion interactions involved in those materials because I understand that high viscosity is related to strong intermolecular attractions. Although, the viscosity argument doesn't work for sticky solids (unless you say that a sticky solid is actually just an extremely extremely viscous liquid).