Is it safe to use washing-up water on shrubs and plants?

Dawn Hunt, by email

ACHRISTINE SAYS The issue with most washing-up liquids these days is that they are derived from petroleum-based materials, and these can cause scorching when used on plants, even when mixed with water. Vegetable-based washing-up liquids are available, meaning you can water your plants after washing your dishes.

Use plant-based washing-up liquid so you can re-use the water