Natural cleaning agents like white vinegar, hydrogen peroxide, baking soda, and tea tree oil are effective against mould. For instance, you can mix white vinegar with water in a spray bottle, apply it to the affected area, let it sit for an hour, and then wipe it clean. Similarly, hydrogen peroxide can be sprayed on mouldy surfaces, left for 10 minutes, and scrubbed away. Baking soda solutions can also be used to clean and prevent mould regrowth.