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Yes, some carpet stains can be permanent. Stains that have been sitting for a long time (weeks, months, or years) are much harder to remove because they have had time to dry and set. Other types that may be permanent include oil-based stains and dye stains. While some cleaners can help, they can also risk dyeing or permanently changing the carpet's color. If you have an old stain and are unsure of the cause, it's best to call a carpet cleaning professional. If DIY methods and professional cleaning fail, you may need to replace that section of carpet or learn to live with the stain.

Carpets can turn brown after cleaning due to a phenomenon called "wicking." It occurs when deep-seated dirt and moisture rise to the surface as the carpet dries because of excessive water or improper rinsing. Additionally, not allowing the carpet to dry thoroughly before walking on it can lead to browning.

Vinegar and baking soda can be effective for removing old carpet stains, although success may depend on the type of stain. There are two common methods for this process.

One method involves combining the ingredients directly on the stain to create a chemical reaction. First, pour a generous layer of dry baking soda over the stain. In a spray bottle, mix distilled white vinegar with 1 cup of warm water and a few drops of liquid dish soap, then spray this solution thoroughly over the baking soda. The mixture will foam as the acidic vinegar reacts with the basic baking soda, which helps loosen and lift the stain. Let this sit for a few hours until it dries, then wipe or vacuum up the residue and blot the area with a clean, dry towel. You can repeat the process if the stain persists.

An alternative method suggests using the ingredients separately. Start by sprinkling baking soda on the stain and letting it sit for 15 to 30 minutes before vacuuming it up. Next, blot the remaining stain with a solution of equal parts white vinegar and water, and then blot the area dry with a clean cloth.

Hydrogen peroxide is usually better for getting rid of urine smells on hardwood than vinegar. Unlike vinegar, hydrogen peroxide is odorless. This can be advantageous if you have a dog that likes to mark areas with a strong scent. Also, hydrogen is a strong oxidizer that can break down bacterial odors, and it is less likely to remove the finish on hardwood flooring than vinegar. Never mix hydrogen peroxide and vinegar. This creates corrosive and toxic peracetic acid.