The answer to 'vacuum stained' is that a vacuum cleaner may not be able to fully remove stubborn stains from carpets or upholstery. Stains can be caused by a variety of substances like food, grease, pet accidents, or tracked-in dirt. While a vacuum can help remove some surface debris, it may not have the suction power or cleaning agents needed to lift set-in stains.
In these cases, you may need to use specialized cleaning products and techniques to treat the stain. This could involve pre-treating the area, using a carpet cleaner or upholstery shampoo, or even calling in a professional cleaning service. They have the right equipment and products to safely and effectively remove tough stains without damaging your carpets or furniture.