Start by removing dust particles from the furniture. Use a vacuum cleaner fitted with the proper attachment for this purpose. Although this might take some effort and time, make sure that you are as thorough as possible while sucking out all the dust from the upholstered furniture.
Now, you will need to attend to any stains on the furniture. Add ¼ cup of soap detergent and 1 cup of water to a large bowl. Thoroughly mix the contents of the bowl with a hand mixer until thick foam is formed in the bowl.
Before applying the cleaning foam on an entire piece of furniture, it would be best to check its results on a small section. This way, even if things go wrong, damage to the furniture would be minimal. Apply the cleaning foam on a small, inconspicuous section of the furniture with a cotton swab and lightly scrub. Allow time for the treated area to dry and check the results to determine if it would be alright to use the homemade cleaning solution for cleaning the furniture.
Scoop up the cleaning foam onto a clean white cloth and lightly scrub the upholstered furniture with the cloth. Do not scrub vigorously because you may end up damaging the furniture. Staying focused on the stained area, and continue until the stain disappears. Treat other stains in a similar manner.
Finally, press a clean paper towel onto the treated area to suck up excess moisture and make sure that the furniture does not get watermarked. Consider fan drying the furniture to speed up the process.