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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.

While it may be possible to use a carpet cleaner on a couch, it is often not recommended and requires significant caution. Some carpet cleaners contain harsh or abrasive chemicals that are unsuitable for soft upholstery fabrics. To determine if it's safe, always check your couch's care tag, which dictates approved cleaning methods. If you decide to proceed, ensure the carpet cleaner has an upholstery attachment and that you are using a cleaning solution specifically designed for upholstery. It is also crucial to avoid oversaturating the fabric. Before cleaning the entire couch, always test the cleaner on a small, hidden area to check for potential damage or discoloration.

The duration of mildew smell in carpets depends on several factors, including the extent of moisture, cleanliness, and ventilation. If promptly addressed, the smell can diminish within a few days to a couple of weeks after thoroughly drying and cleaning the carpet. However, in severe cases or if not properly treated, the smell might persist. Persistent odors could indicate deeper mildew growth, requiring professional cleaning or, in extreme cases, carpet replacement to completely eliminate the smell.

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.