Here’s the fix.

1. Remove the lid
2. Wipe down the outside with a cloth or paper towel really well
3. Place in the centre of the microwave plate
4. Set it on around 800w (usually 60% power in the US, 100% power in UK/Europe)
5. Microwave for 2 minutes, for about half tin, until mostly clear.
6. IT IS HOT! Repeat 30s micro and check, until it’s clear.
7. When mostly clear, quick 10s stir with a teaspoon.
8. Using protection, grab the tin and place in fridge for 2 hours.
9. It’ll be good as new!