Wait for the residue to soften, maybe five to 10 minutes, then wipe it up with a terry cloth or other rough-textured rag. Refold or rotate the cloth after each pass, so you don’t smear the gunk ...

Scrub the duct tape residue. Once the mess is gone, wipe off any WD-40 remaining on the surface with a clean part of the rag. For the surfaces you don't want to use WD-40 on, use isopropyl alcohol.

Meanwhile, if you have softened tap water, you can still see that white stuff on the outside of your terracotta pots. But in this case, it’s likely caused by your soil fertilizer, which contains ...