Step-by-Step DIY Recipes and Formulations

Here are two proven recipes, from a standard mix to a stronger formulation for tough weeds.

1. Standard All-Purpose Weed Killer

This is the most common and balanced formulation, suitable for a wide range of annual weeds and young perennial weeds in cracks, gravel, and patio joints.

Formula: Mix 2 parts water with 1 part 70% isopropyl alcohol. For example: 2 cups water + 1 cup rubbing alcohol. Add 1 teaspoon of liquid dish soap. Shake gently to mix.

2. Heavy-Duty Formula for Resilient Weeds

For weeds with thick, waxy leaves (like certain sedges or mature dandelions), a stronger solution can be more effective.

Formula: Mix 1 part water with 1 part 91% isopropyl alcohol. For example: 1 cup water + 1 cup rubbing alcohol. Add 1-2 teaspoons of liquid dish soap. Shake to combine. Note: This mix is more volatile and poses a higher fire risk; use with extreme caution and avoid use on very hot, sunny days.

3. Important Mixing Instructions

Always add the water to the spray bottle first, followed by the rubbing alcohol, and then the soap (if using). This minimizes foaming and ensures proper mixing. Never mix or store the solution near an open flame or heat source.