There can be quite a bit of contaminants sticking to your rug fibers and the base. Vacuuming alone will not release them, so cleaning them eventually is inevitable. When hiring a company, you have to wonder (or at least you should) what cleaners are being used to clean your area rugs. Optical Brighteners, dyes, synthetic fragrances, petrochemical solvents, carcinogens, and "VOCS" are common in many rug cleaning chemicals. Often, the rug cleaning chemicals used are slow to biodegrade, accumulate over time, react with new chemistry, or biodegrade to more harmful compounds. This contributes to a toxic household environment were children, pets and home occupants crawl, lie and breathe the leftover residues. Some companies purchase large volumes of raw crude rug cleaning chemicals at discount prices for use in their area rug cleaning plants. These cleaners generally have high ph levels and can breakdown the natural oils in your area rug!