1. Introduction
The DayPlus 21V Cordless Pressure Washer is a versatile and portable electric cleaner designed for a wide range of cleaning and irrigation tasks. Powered by a high-capacity 21V lithium-ion battery, this device offers the freedom of cordless operation, allowing you to clean anywhere without being tethered to a power outlet. Its adjustable nozzle and multiple spray modes make it suitable for everything from removing tough stains on vehicles and driveways to gentle watering of plants and bathing pets. The compact and lightweight design ensures ease of use and portability for both indoor and outdoor applications.
2. Safety Information
Please read and understand all safety warnings and instructions before operating this product. Failure to follow the warnings and instructions may result in electric shock, fire, and/or serious injury.
- Always wear appropriate personal protective equipment, including eye protection, when operating the pressure washer.
- Do not direct the water spray at people, pets, electrical devices, or the unit itself. High-pressure spray can cause injury.
- Ensure the battery is fully charged before use and stored in a dry, cool place. Do not expose the battery to water or extreme temperatures.
- Keep children and bystanders away from the operating area.
- Never operate the pressure washer without a water source connected. Running dry can damage the pump.
- Use only clean water. Do not use corrosive liquids or solvents that could damage the unit or cause harm.
- Inspect the unit, hose, and accessories for any damage before each use. Do not operate if damaged.
3. Package Contents
Carefully unpack all items and ensure you have received the following components:
- Cordless Pressure Washer Unit
- 21V Lithium Battery (1 or 2, depending on purchase)
- Power Adapter/Charger
- Multi-Adjustable Nozzle (0-180 degrees)
- 0° Specific Nozzle
- Foam Pot (300ml capacity)
- Water Filter
- Water Hose (5 meters / 16.4 feet)
- Quick Connectors for fuselage/water pipes and body/water bottle
- Storage Bag

Figure 1: Included Components
4. Assembly and Setup
Follow these steps to assemble your DayPlus Cordless Pressure Washer:
- Attach the Gun Barrel: Align the barrel of the cleaning gun with the inner slot of the water outlet on the main unit. Rotate it to fit securely in place.
- Connect the Water Hose: Attach the quick connector to the water input port on the pressure washer. Insert the water hose into the quick connector and retract it to secure the connection. Ensure the water filter is attached to the other end of the hose for drawing water.
- Insert the Battery: Align the 21V lithium battery with the battery slot on the bottom of the pressure washer handle and slide it in until it clicks. To remove, press the release button on the battery.
- Choose a Water Source: The pressure washer can draw water from various sources using its 5-meter (16.4ft) hose and filter basket. Common sources include buckets, bottles (using the appropriate connector), or natural bodies of water like rivers or pools. Ensure the filter basket is submerged and free from obstructions.
- Attach Nozzle/Foam Pot: Select your desired nozzle (multi-adjustable or 0°) or the foam pot and attach it to the end of the gun barrel.

Figure 2: Assembly Steps
5. Operating Instructions
5.1 Powering On/Off
Once the battery is inserted and the water source is connected, simply press and hold the trigger to start the water flow. Release the trigger to stop.
5.2 Water Absorption Methods
The pressure washer supports three primary water absorption methods:
- Bucket: Place the filter end of the hose into a bucket of water.
- Bottle: Connect a compatible bottle (e.g., cola bottle) to the unit using the provided connector.
- River/Pool: Submerge the filter end of the hose into a natural water source.

Figure 3: Water Absorption Options
5.3 Adjusting Spray Modes
The pressure washer features multiple spray modes to suit different cleaning needs:
- Multi-Adjustable Nozzle: Rotate the nozzle head to change the spray pattern from 0 degrees (a concentrated stream) to 180 degrees (a wide fan spray). This allows for precise control over the irrigation or cleaning range.
- 0° Specific Nozzle: Provides a powerful, concentrated stream for stubborn dirt and grime.
- Foam Mode: Attach the foam pot filled with appropriate detergent to create a rich foam for deep cleaning.

Figure 4: Multiple Spray Modes

Figure 5: Adjusting Spray for Irrigation
5.4 Using the Foam Pot
Fill the 300ml foam pot with your preferred car wash soap or cleaning detergent. Attach it to the gun barrel. The foam mode will mix the detergent with water to create a thick foam, ideal for pre-soaking dirty surfaces like cars or bikes.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your pressure washer.
- Clean the Water Filter: The filter basket on the hose effectively filters impurities. Regularly inspect and clean the filter to prevent clogging and ensure consistent water flow. Remove any accumulated debris, particles, waste leaves, or sludge.
- Rinse After Use: After using detergents or cleaning solutions, run clean water through the pressure washer for a few minutes to flush out any chemical residues.
- Battery Care: Charge the 21V lithium-ion battery using the provided power adapter. Do not overcharge. Store the battery in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, charge the battery to about 50% capacity.
- Nozzle Cleaning: If the nozzle becomes clogged, remove it and clear any obstructions using a small pin or needle.
- Storage: Disconnect all components and drain any remaining water from the unit and hose. Store the pressure washer and its accessories in the provided storage bag in a dry, protected area.
7. Troubleshooting
If you encounter issues with your DayPlus Cordless Pressure Washer, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No water flow or weak pressure |
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| Unit does not turn on |
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| Water leaks from connections |
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8. Specifications
| Feature | Specification |
|---|---|
| Voltage | 21V |
| Battery Capacity | 1.5Ah Lithium-ion |
| Water Hose Length | 5 meters (16.4 feet) |
| Foam Pot Capacity | 300ml |
| Product Weight | 1.25 KG |
| Body Material | Engineering Plastic |
| Interface Material | Engineering Plastic |
| Nozzle Material | Engineering Plastic |
| Water Spray Type | Spray (Adjustable 0-180°) |
| Handle Type | Finger Type |
| Battery Included | Yes |
| With Water Pipes | Yes |
| Package Length | 35 cm |
| Package Width | 27 cm |
| Package Height | 12 cm |
| Package Weight | 5.0 kg |
9. User Tips
- For optimal performance, ensure the battery is fully charged before starting any cleaning task. The 1.5Ah lithium-ion battery is designed for extended working hours.
- Take advantage of the multi-adjustable nozzle. A narrow spray is great for tough spots, while a wider fan spray is perfect for rinsing larger areas or gentle watering.
- The lightweight design (1.25 KG) and one-handed operation make this pressure washer very user-friendly, even for extended periods or for users who may find heavier equipment challenging.
- Always use the water filter when drawing water from non-tap sources like buckets or natural bodies of water to protect the pump from debris.
- The compact size makes it ideal for camping trips or outdoor activities where a portable cleaning solution is needed.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.