If you want your clothes to come out completely clean, try adding aspirin or black pepper to your washing machine.

What science says about this:

One of the most common causes of the dull appearance of clothing is the presence of soap residue. The coarse shape of the black pepper prevents soap residue from adhering to the tissue, which is a considerable advantage. This not only preserves the brilliance of clothing, but also ensures that the colours remain true to their original state.

Include these simple tips in your washing routine and you can enjoy cleaner and brighter clothes.