If you buy a tub of GOOP hand cleaner, don't leave it stored on a shelf above the dryer for years and years. But especially don't open said tub of Goop after these years of improper storage, because the entire container will inevitably spill everywhere when you discover it is not in its original semi-solid form.
Goop in its liquified state is not a fun substance to clean off of multiple surfaces like sinks, cabinets, countertops and linoleum floors and it spreads very quickly (thank goodness it didn't land on the carpet!). However, it does leave the aforementioned surfaces (and your hands that were previously covered in WD-40) feeling clean and conditioned.
Note: This is actually a fantastic product for cleaning up after messy projects like oil painting or working with tools and grease and things of that nature. I first learned about it from fellow art students in college. Just don't let it sit around too long...