Introduction
The BISSELL Stain Eraser Duo is a versatile 2-in-1 cordless cleaning device designed to tackle both wet and dry messes. It functions as a portable deep cleaner for stains and spills, and a powerful hand vacuum for dry debris. This manual provides essential information for the safe and effective use, maintenance, and troubleshooting of your device.
Important Safety Instructions
Before using your BISSELL Stain Eraser Duo, please read all instructions carefully. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always disconnect the charger from the electrical outlet when not in use and before cleaning or servicing.
- Do not immerse the device in water or other liquids.
- Use only BISSELL cleaning formulas specifically designed for this machine to prevent internal component damage.
- Keep hair, loose clothing, fingers, and all parts of body away from openings and moving parts.
- Do not pick up anything that is burning or smoking, such as cigarettes, matches, or hot ashes.
- Do not use to pick up flammable or combustible liquids, such as gasoline, or use in areas where they may be present.
- Do not allow to be used as a toy. Close attention is necessary when used by or near children.
- Use only as described in this manual. Use only manufacturer’s recommended attachments.
- If the charging cable or plug is damaged, do not use.
Product Overview & Components
Familiarize yourself with the parts of your BISSELL Stain Eraser Duo:

The BISSELL Stain Eraser Duo main unit shown with both the dry vacuum and wet deep cleaning attachments, along with the included crevice tool, upholstery tool, and two bottles of PET PRO OXY Spot & Stain Formula.

A close-up view of the various attachments included with the Stain Eraser Duo: a narrow crevice tool, a brush tool for scrubbing, and a wider upholstery tool.
Included Components:
- Main Handheld Unit (Motor Body)
- Dry Vacuum Tank & Nozzle Assembly
- Wet Deep Cleaning Tank & Nozzle Assembly
- Crevice Tool
- Upholstery Tool
- Stain Brush Tool (integrated with wet nozzle)
- Charging Adapter
- BISSELL PET PRO OXY Spot & Stain Formula
Setup
1. Charging the Battery
Before first use, fully charge the device. The lithium-ion battery provides cordless convenience.
- Connect the charging adapter to the charging port on the main unit.
- Plug the adapter into a standard electrical outlet.
- The charging indicator light will illuminate. Allow approximately 4 hours for a full charge.

The BISSELL Stain Eraser Duo being plugged into a wall outlet for charging, highlighting its cordless convenience.
2. Attaching Cleaning Heads
The Stain Eraser Duo features interchangeable wet and dry cleaning heads.
- To attach a head, align the head with the main unit and push firmly until it clicks into place.
- To remove, press the release button (usually located near the connection point) and pull the head away.
3. Preparing for Wet Cleaning (Deep Cleaner)
For deep cleaning, you will need to fill the clean water and formula tank.
- Ensure the wet deep cleaning tank is attached to the main unit.
- Locate the fill cap on the clean water tank.
- Pour BISSELL PET PRO OXY Spot & Stain Formula into the tank up to the indicated fill line.
- Add warm tap water (not boiling) up to the water fill line.
- Securely close the fill cap.

A person pouring BISSELL PET PRO OXY Spot & Stain Formula into the clean water tank of the Stain Eraser Duo, preparing it for deep cleaning.
Operating Instructions
Using as a Hand Vacuum (Dry Cleaning)
The dry vacuum attachment is ideal for picking up dry debris and pet hair from various surfaces.
- Ensure the dry vacuum tank and nozzle assembly is securely attached.
- Press the power button to turn on the vacuum.
- Guide the nozzle over the dry mess to suction it into the debris tank.
- For tight spaces, attach the crevice tool. For wider areas, use the upholstery tool.
- When finished, turn off the vacuum and empty the dry debris tank.

A person using the BISSELL Stain Eraser Duo with the dry vacuum attachment to clean up scattered dry cereal on a carpeted floor.

A split image demonstrating both the wet deep cleaning mode on a liquid spill and the dry vacuum mode on scattered debris, showcasing the 2-in-1 functionality.
Using as a Deep Cleaner (Wet Cleaning)
The deep cleaning attachment is designed for tackling wet spills and stains on carpets, upholstery, and rugs.
- Ensure the wet deep cleaning tank and nozzle assembly is securely attached and filled with formula and water.
- Press the power button to turn on the device.
- Position the nozzle directly over the stain.
- Press the spray trigger to dispense cleaning solution onto the stain.
- Slowly pull the nozzle across the stain while maintaining pressure on the spray trigger.
- Release the spray trigger and slowly pull the nozzle over the same area to suction up the dirty solution.
- Repeat passes as necessary until the stain is removed.
- When finished, turn off the device and empty the dirty water tank.

A person using the BISSELL Stain Eraser Duo with the deep cleaning attachment to remove a stain from a light-colored upholstered chair.

The BISSELL Stain Eraser Duo in action, deep cleaning a stain on a light-colored carpet, showing the dirty water being suctioned.
Maintenance
Regular maintenance ensures optimal performance and extends the life of your BISSELL Stain Eraser Duo.
1. Emptying & Cleaning Dirty Water Tank (Wet Cleaning)
- After each wet use, turn off the device.
- Remove the wet deep cleaning tank assembly.
- Locate the 'PULL' tab on the dirty water tank and open it.
- Pour out the dirty water into a sink.
- Rinse the dirty water tank thoroughly with clean water.
- Allow the tank to air dry before reattaching.
2. Emptying & Cleaning Dry Debris Tank & Filter (Dry Cleaning)
- After each dry use, turn off the device.
- Remove the dry vacuum tank assembly.
- Open the tank to access the debris and filter.
- Empty the collected dry debris into a waste bin.
- Remove the filter and tap it gently to dislodge dust. Rinse the filter with water if necessary, ensuring it is completely dry before reinserting.
- Rinse the dry debris tank with water and allow it to air dry.
3. Cleaning Nozzles & Attachments
- Wipe down all nozzles and attachments with a damp cloth after use.
- For the wet cleaning nozzle, ensure the spray aperture is clear of debris.
- The stain brush tool can be rinsed under running water.
4. Storage
Store the device in a dry, indoor area at room temperature. Ensure both tanks are empty and clean before storage.
Troubleshooting
If you encounter issues with your BISSELL Stain Eraser Duo, refer to the common problems and solutions below:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power / Not Turning On | Battery is not charged. | Ensure the device is fully charged (approx. 4 hours). |
| No Suction (Dry) | Dry debris tank is full or clogged. Filter is dirty. | Empty debris tank. Clean or replace filter. |
| No Suction (Wet) | Dirty water tank is full. Nozzle is clogged. | Empty dirty water tank. Clear any blockages from the nozzle. |
| No Spray (Wet) | Clean water tank is empty. Spray nozzle is clogged. | Refill clean water tank. Clear any blockages from the spray nozzle. |
| Leaking | Tanks not properly seated. Tank caps not sealed. | Ensure tanks are securely attached and caps are tightly closed. |
Specifications
| Feature | Detail |
|---|---|
| Brand | Bissell |
| Model Name | Eraser Duo Cordless Portable |
| Model Number | 3705 |
| Color | Black |
| Item Weight | 3.08 Kilograms (6.78 pounds) |
| Product Dimensions | 8.98 x 5.28 x 23.31 inches |
| Capacity | 16 ounces |
| Power Source | Battery Powered (1 Lithium Ion battery included) |
| Form Factor | Handheld |
| UPC | 011120271898 |
| Manufacture Year | 2021 |
Warranty & Support
Information regarding product warranty and customer support is typically provided directly by the manufacturer or retailer at the time of purchase. For the most current and detailed information, please refer to the following:
- Manufacturer's Website: Visit the official Bissell website for warranty registration, product support, FAQs, and contact information.
- Purchase Documentation: Check your product packaging, receipt, or any included warranty cards for specific terms and conditions.
For direct assistance, you may contact Bissell customer service through their official channels.





