by Quick answer: To dry a mattress quickly, strip it and blot up moisture with towels, extract deeper water with a wet/dry vacuum, cover the area in baking soda for several hours to pull out remaining moisture, then run fans and a dehumidifier with the mattress propped upright. Aim to finish within 48 hours to prevent mold.
By the MattressNut editorial team · Updated June 2026
Drying a Wet Mattress Explained
Speed is everything. A wet mattress can become a mold hazard within about 48 hours, so the sooner you start, the better your odds of saving it. Light moisture may dry in a few hours with good airflow, while a heavy soaking can take 24 to 48 hours or longer.
Step by Step
- Strip and blot. Remove all bedding, then press (do not rub) clean towels into the wet area to soak up as much as possible, swapping towels as they dampen. Rubbing pushes water deeper.
- Extract deeper moisture. If you have a wet/dry shop vacuum, use it to pull water from inside the mattress. You can rent one from most hardware stores. Skip this if your mattress type warns against vacuuming, since strong suction can displace internal fillings.
- Apply baking soda. Sprinkle a thick layer over the damp area; it absorbs hidden moisture and helps prevent mold. Let it sit at least 4 hours (overnight for heavy saturation), then vacuum it up.
- Maximize airflow. Prop the mattress upright against a wall so both sides breathe, position a high-powered fan 2-3 feet away aimed at the spot, and run a dehumidifier on its highest setting. Open windows if outdoor humidity is lower than indoors. Leave fans running for several hours.
- Add sunlight if possible. Sun helps dry and sanitize, but bring the mattress back in before nightfall so condensation does not undo your work.
Check it is truly dry: press your hand firmly on the spot for 30 seconds; coolness or dampness means it needs more time. Only use the mattress again when it is 100% dry and odor-free.
Tips & What to Avoid
Do not use high heat. A hairdryer on a low setting can spot-dry, but high heat damages foam, and you should not raise the room above 80°F. For extreme saturation, clay litter absorbs more than baking soda but makes a bigger mess. Importantly, some mattresses cannot be saved: if the water was sewage or floodwater, or you see any mold, replace it rather than risk your health.
The Saatva Angle
If a soaking has left your mattress permanently damp, smelly, or moldy, drying it will not fix it, and sleeping on it is a health risk. When replacement is the honest call, the Saatva Classic is a durable innerspring hybrid worth considering, and pairing any new mattress with a waterproof protector helps you avoid a repeat. Try to dry and salvage first; only replace when the bed is genuinely beyond recovery.
Bottom Line
Move fast: blot, extract, baking soda, then fans and a dehumidifier with the mattress propped up, plus sunlight if you can. Beat the 48-hour mold window, and replace the mattress if the water was contaminated or mold has set in.
Bottom line: Blot, baking soda, then maximum airflow, all within 48 hours.
Related: our full Saatva mattress review.