- 2 L white vinegar (the cheap stuff)
- 250 grams salt
- ½ tbsp liquid dish soap (this is your bonding agent to make it stick to the plant - more won't hurt)
- Stir well. Drop liquid in the middle of the unwanted plant. Use as needed.
It works on stubborn dandelions and pretty much anything else you want gone, so make sure it lands where you want it. You likely only need a few drops in the centre of the plant, but depending on its size, you may need to add more.