No all set-in stains are removeable, but if you do not give it a try, you will never know. The deeper into the carpet the stain is, the harder it will be to remove and it could take several attempts. One of the best stain removers is baking soda.

1. First, vacuum the area to remove any loose dust, dirt or hair.

2. Put 1 cup of baking soda into a large bowl and add 2 tbsp of water and stir into a paste. The paste should be thick like toothpaste. If necessary, you can add 1tbsp of water at a time for a pastier consistency.

3. Scoop paste out with a spoon, put onto the carpet and gently work into the carpet with your fingers so as not to damage carpet fibres. Leave paste to sit.

4. Next, place five to eight paper towels over the stain and weight them down with something heavy to help the stain lift from the carpet.

5. Lastly, vacuum the baking soda crumbs from the carpet.

If it appears to have no effect, this method may not work for this particular stain. If the stain is lighter, it may take a couple more tries to fully remove the stain.