On screws
If you’re having problems driving a screw into wood, use Marseille soap.
Instructions for use: Rub the screw thread on a dry Marseille soap cube and it will go in smoothly.
Unblocking drawers
For drawers that keep getting stuck, get some Marseille soap to the rescue!
Instructions for use: Rub a piece of Marseille soap along all the drawer edges and for an even more thorough job, along all the runners.