(Blue-)Green Weed Spray - from household ingredients.

 by Marcos

Step 3: The finished product

You're already greener, because you've re-used the original vinegar bottle.

Be sure to label it clearly so no mistakes are made! You wouldn't want anyone adding this to their laundry, or serving it at breakfast. The ingredients are fairly innocuous, and it's still a good idea to keep the jug out of reach of children.
 
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