Consistency is key when dealing with aphids. This means committing to applying your chosen method - whether water or a deterrent liquid - directly to the infested parts of the plant, especially the undersides of leaves, 2–3 times a day. This disrupts their rapid breeding cycle and either kills or dislodges the aphids.

Diluted washing-up liquid or plain tap water applied with a fine, high-pressure mist is often sufficient. Repeat this process for 3–5 days to significantly reduce the aphid population.

For a stronger solution, you might want to consider sprays like neem oil or horticultural oil. Apply these directly to the aphids, ensuring thorough coverage. Important: If you are treating edible plants, always check the product label for safety guidelines and adhere to the recommended withholding period before harvesting.