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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.

Cleaning the carpet in a standard-size room should take about 30 to 45 minutes, depending on the size of the square footage. If your bedroom carpet has serious stains or wear patterns, it may take longer to treat it. An experienced carpet cleaner will likely move faster through this task than if you DIY it with a rented carpet cleaner.

There aren’t health dangers to sleeping in a room where the carpet was just cleaned. In some cases, strong-scented detergents may trigger allergies in sensitive people, but otherwise there’s not much to worry about. 

A greater concern is walking across damp carpet, which is undesirable. To air out the room and help the carpet dry, it’s a good idea to stay off the floors for about 24 hours if possible. If you’re cleaning carpets in the bedroom, you may want to make alternative sleeping plans. 

The Centers for Disease Control and Prevention (CDC) recommends using an EPA-registered disinfectant product to disinfect a house properly. If such a product isn't handy, a strong bleach solution can disinfect high-touch surfaces. Before hiring a professional, be sure to discuss the type of chemicals and disinfectants they plan to use to ensure they’re safe for household use.