Sprayer Cleanout Steps
How to clean your sprayer properly to protect crops, equipment, and yourself
Sprayer cleanout prevents residue carryover, crop damage, clogged parts, and equipment corrosion. Doing it right helps avoid costly errors. Always follow the label instructions of the chemicals you used—and the ones you’ll use next. Use this guide for standard cleanout steps, then adapt to your particular tank, sprayer model, hoses, booms, nozzles and chemicals.
Why Cleanout Matters
- Residues of herbicides/pesticides can remain in sprays, hoses, booms, nozzles, strainers, screens.
- Sensitive crops can suffer damage from tiny residue amounts. Even after weeks or months.
- Some herbicides/spray agents cling more strongly than others. Tanks made of plastic or rubber hoses are more prone to staining or trapping residues.
- Clean equipment lasts longer; fewer breakdowns. Cleaning helps maintain nozzles, strainers, filters, and plumbing.
Safety First
Before starting cleanout:
- Wear protective gear: gloves, face shield or goggles, long sleeves, waterproof apron if available.
- Make sure you are not in drift zones or near sensitive crops.
- Be aware of where rinse water (rinsate) will go: avoid contaminating streams, wells, or places where livestock or people might access it.
- Have spill kit ready.
Equipment to Inspect / Remove Before Cleanout
- Nozzles, spray tips, nozzle bodies
- Screens, strainers, filters
- Boom end caps (if used)
- Seals and gaskets
- Any mixing/loading equipment connected (inductors, shuttles)
- Pumps, hoses, lines, stirring or agitation units
Step-by-Step Sprayer Cleanout Procedure
Use these steps as a strong general guide. For certain herbicides or products, label instructions might require more or different actions.
| Step | Action |
|---|---|
| 1. Spray Out Residual Product | As soon as spraying is done, spray out whatever mix is left in the tank, hoses, and boom. Don’t let the spray mix sit. |
| 2. Rinse with Clean Water | Partially fill tank (e.g. ~10% of capacity or more per label) with clean water. Recirculate the water through the system: pump it, run it through booms, hoses, nozzles. Spray some of it out through the boom. |
| 3. Remove and Clean Screens, Strainers, Nozzles & Filters | Remove these components; soak/clean with water + mild detergent or specified cleaner. Inspect for damage. Clean or replace as needed. |
| 4. Add Cleaning Agent | Set up the tank with water plus a cleaning agent (commercial tank cleaner, ammonia solution, detergent etc.), according to product labels. Stronger agents may be needed for stubborn or oily/herbicide residues. |
| 5. Agitate and Recirculate | Run the sprayer’s agitation, operate pump, flow cleaning solution through hoses and booms for several minutes (often 5-15 minutes). Ensure all components are addressed. |
| 6. Soak / Let Stand | After agitation, allow the cleaning solution to sit inside tank/lines for some time (several hours or overnight if possible) so residues loosen. |
| 7. Spray Out / Flush Cleaner | Spray the cleaning agent solution through the boom and nozzles. Then drain. Flush with clean water to remove cleaning solution. Repeat rinse until water is clear with no visible residue. |
| 8. Final Rinsing | Multiple rinses are usually more effective than one big rinse. Run clean water through all lines, hoses, booms, filters, nozzles. Check that no residual cleaning agent remains. |
| 9. Clean Exterior | Wash outside surfaces: tank interior lid, tank walls, boom exterior, pump seals, valves. Residue or drift can stick outside too. |
| 10. Reassemble & Store Safely | Put screens, tips, nozzles back. Check all fittings. Store sprayer in appropriate place. Protect from freezing if relevant. |
Special Considerations
- Switching Products or Crops When moving from one type of chemical to another (especially sensitive to carryover), or switching to a sensitive crop, clean more thoroughly. Residue of prior products (especially plant growth regulator herbicides, ALS inhibitors) can cause big damage.
- Tank Material & Hose Material Plastic/polyethylene tanks, rubber hoses, older tanks tend to trap more residue. Smooth, inert materials are easier. Regular inspection of hoses and tanks helps detect buildup.
- Sunlight, Heat, Chemical Stability Some chemicals degrade in sunlight or heat; others become more potent with high temperatures or through certain cleaning chemicals. Always store/clean in shaded or covered areas if possible. Check label for guidance.
- Labels are Law The chemical label often prescribes clean-out steps and cleaning agents. These must be followed even if they differ from general advice. Label instructions override general practices.
- Disposal of Rinsate / Waste The rinse water (rinsate) must be disposed of correctly. Options:
- Spray back on fields labeled for the chemical (not violating label guidance).
- Use an approved disposal site.
- Avoid dumping near wells, waterways, or into storm drains.
- Make sure rinsate does not harm environment, animals, people.
Common Cleaning Agents & When to Use Them
| Agent | Pros / Uses | Warnings / Limitations |
|---|---|---|
| Commercial tank cleaners | Formulated for both water- and oil-soluble chemicals; good general performance. Performance often best for oily or stubborn residues. | Cost; need correct mixing ratio; some cleaners may be harsh to materials if left too long. |
| Household ammonia | Helps with boosting pH, dissolving some residues, especially certain herbicides. | Do not mix with bleach or materials containing ammonia + bleach. Ammonia alone does not deactivate all chemicals. Follow label. |
| Detergents / Soap | Removes oily emulsions, helps clean filters, nozzles; mild on materials. | May not be enough alone for tough residues; might leave foam; can interfere with some chemical residues if incorrectly used. |
| Bleach (sodium hypochlorite) | Can deactivate certain herbicides; useful for heavy contamination. | Strong; can damage some materials; reactive with ammonia; safety hazards; dispose carefully; follow label. |
| Alkaline or high-pH cleaners | Some formulations elevate pH significantly, improving solubility of some hard-to-clean residues. | Can corrode metals or degrade seals/gaskets over time; must be compatible with the equipment. |
Typical Cleanout Workflow
Here’s a typical timeline for a cleanout when switching from herbicide A to chemical B or before spraying a sensitive crop:
- After finishing spray, immediately spray out mixture from tank/boom.
- Rinse tank with clean water (~10% capacity), run through boom, hoses. Spray out.
- Remove filters, strainers, nozzles. Clean separately.
- Add cleaning agent + water (as per chemical label). Agitate & circulate for ~10-15 mins.
- Let sprayer sit (tank + plumbing) overnight if possible.
- Spray cleaning solution through boom. Drain.
- Rinse with clean water several times, through all lines. Ensure everything is clean; check clarity.
- Clean external parts (boom, tank lid, pump housing).
- Reassemble, test operation, check for leaks.
- Dispose of rinse/waste properly.
Be Aware of Problem Areas / Common Mistakes
- Letting spray mixture sit for long before cleaning; residues harden.
- Forgetting to remove end-caps on booms. Residue accumulates there.
- Overlooking filters, strainers: they trap solids/residues, often missed.
- Using insufficient water/cleaner volumes; not achieving full coverage.
- Not letting cleaning solution soak long enough.
- Improper disposal of residual spray or rinse water.
Maintenance Between Cleanouts
- At end of every day’s spraying, do a water flush even if you’re using same product next day. Helps avoid buildup.
- Check hoses, seals and gaskets for wear or cracking. Replace if needed.
- Keep tools for cleaning together (brushes, buckets, spare tips) so cleanout is easier.
- Keep records: what chemical was last used, what cleanout steps, when. Helps trace any crop damage issues.
Checklist You Can Use
Before spraying next crop, tick off:
- Sprayed out all leftover solution
- Tank rinsed with clean water
- Nozzles, screens, filters removed and cleaned
- Cleaning agent used (correct type/concentration)
- System agitated and recirculated
- Soak period observed (if needed)
- All booms, hoses, lines flushed and sprayed out
- Final rinse water is clean/no residue
- Exterior cleaned
- Rinsate disposed properly
- Equipment reassembled and tested
Legal and Label Guidance
- Always read the chemical label. It may require a specific cleaner, number of rinses, or minimum soak time. Labels are legally binding.
- Check local, state, and federal rules about disposal of pesticide rinse water; improper disposal can violate environmental laws.
- Some herbicides have extreme sensitivity for certain crops; even minute residues can damage non-target plants. If switching to a sensitive crop, consider dedicating equipment or stricter cleanout.
Case Study / Example Scenarios
Here are a few common situations and how cleanout should be handled in each:
| Scenario | Recommended Adjustments |
|---|---|
| After using a strong herbicide like dicamba / 2,4-D and then spraying sensitive broadleaf plants | Use the most aggressive clean-out path: strong tank cleaner + multiple rinses + overnight soak; clean every hose, tip, screen; test a small batch before full field. |
| Daily reuse of same product, same crop | Basic flush + rinse + filter check may suffice; still good to do a full clean periodically. |
| Spraying oily or emulsion-based formulations | Use detergent cleaners; ensure surfactants dissolved; rinse until no film remains; possibly use hot water if safe. |
| Equipment used infrequently, stored long time | Clean thoroughly before storage; dry if needed; check seals after storage; flush again before use after long rest. |
FAQs
Q: How many rinses are enough?
A: At least two rinses with water + cleaning agent, then several rinses with clean water until all residue and cleaning agent are gone. Many guides recommend triple-rinse.
Q: Can I use just water if I sprayed a mild chemical?
A: Sometimes yes, especially for simple or low-risk products. But water alone often cannot remove residues that have adhered or dried. If you skip cleaner, risk of residue carryover increases. Always check label.
Q: Is soaking overnight really necessary?
A: For many products, yes. It allows residues to loosen. If time doesn’t allow, longer soak or more rigorous rinse may reduce risk.
Q: What about cleaning the exterior of the sprayer?
A: Don’t skip it. Residue outside tank/booms/pump can lead to contact exposure, drift, runoff. Clean tank lid, boom arms, fittings.
Summary
Proper sprayer cleanout:
- Removes harmful residues
- Protects next crop and environment
- Keeps equipment working well
Follow label instructions, use correct cleaning agents, be thorough on all parts of the system, dispose of rinse water properly. A little effort before spraying can prevent big problems and financial losses later.