Cleaning an old neglected clove box with gicky oil paint
1. Scrape out as much paint as possible with a palette knife or whatever.
2. Add some linseed or walnut oil to the remaining paint
3. Wipe out with paper towel or cloth
4. Repeat 2 and 3 a couple more times
5, some stubborn paint wouldn't come out, so I added a drop of clove essential oil to that spot, close lid of oil to prevent spilling. Immediately start rubbing the oil with a cloth and watch how most of the paint desolves.
6. (Optional) curse at your own stupidity as nail polish melts from the clove oil fumes and contact. Metaphorically slap forehead in frustration as you remember that although most nasty artist solvents don't care about nail polish, clove essential oil is about 50 times more powerful than OMS. Clove essential oil, like all essential oils, are powerful stuff and need respect.
7. If wood, wipe with a mixture of linseed oil and clove essential oil, about 10:1 (mostly linseed)