Viper Heavy Duty Concentrated Coil Cleaner 3.785L (RT390G)

Viper Heavy Duty RT390G is a concentrated detergent/degreaser coil cleaner for greasy condensers, evaporators and other HVAC/R surfaces where you want strong cleaning performance without stepping up to an acid or alkaline brightener. It is a practical fit for tradies servicing outdoor condensers, dirty evaporators, AHUs, cold rooms and other heavily soiled equipment. Browse the full coil cleaner range or compare more products in the Viper cleaning chemicals collection.

Quick summary

This 3.785L concentrate is the heavy-duty all-rounder in the Viper range. It is designed for strong degreasing and grime removal on condenser and evaporator coils, while remaining suitable for all metals and approved for aluminium micro-channel coils when used as directed.

Best for

• Outdoor condenser coils with built-up grease, grime and general dirt
• Evaporator coils where you need stronger cleaning than a light aerosol or maintenance spray
• AHU rooms, cold rooms, refrigerated trailers and other greasy plant surfaces
• Tradies who want one concentrated cleaner that can cover multiple HVAC/R cleaning jobs
• Workshops and service vans that already use Viper applicators and want a larger trade-size bottle

Not ideal for

• Jobs where you specifically need a brightener to lift oxidisation or hard carbon deposits
• Indoor evaporator-only work where you want a dedicated low-foam product first
• Customers wanting a ready-to-use aerosol rather than a concentrated cleaner
• Situations where drain pans or condensate lines are already blocked and loosened debris could create runoff issues

Why tradies choose it

• Strong degreasing without an acid/alkaline brightener: a good middle ground when coils are dirty but you do not need brightening chemistry.
• Wide application range: suitable for condensers, evaporators and a broad range of greasy HVAC/R and workshop surfaces.
• Microchannel-friendly: safe for all metals and OEM approved for aluminium micro-channel coils.
• Concentrated format: one 3.785L bottle covers far more work than a small ready-to-use cleaner.
• Flexible rinse options: can be used in rinse and no-rinse workflows depending on coil type, dilution and site conditions.

Key specs

Where it fits in the Viper range

Choose Viper Heavy Duty when you need stronger degreasing than a light maintenance cleaner but do not need an aggressive brightener. If your main job is indoor evaporator cleaning, the Viper Evaporator Coil Cleaner 3.785L is the more targeted option. If you are cleaning outdoor coils with oxidisation or hard carbon deposits, step up to Viper Brite 3.785L. If you want a quick aerosol for light maintenance or tight access, see Viper AC Coil Cleaner 510g.

Compatibility and setup notes

This is a concentrated cleaner, so application method matters. It is commonly used with the Viper Foam Sprayer for flexible on-site foam or jet application, or the Viper Foam Gun when you want hose-fed foam and fast condenser cleaning. For split-system indoor work where runoff control matters, pair it with a wash bag or complete AC cleaning kit. If you need help building a cleaning setup for vans, maintenance teams or repeat service work, use the personalised quote request form.

Use and rinse guidance

This product is not “always no-rinse” in every scenario, and that is important buyer information. Supplier guidance says condenser coils can be given a light rinse if water is available, with no-rinse use on condensers only at higher dilution. Evaporator coils may be used in a no-rinse workflow when diluted appropriately and where loosened debris will not create a drain or pan blockage. For food-processing areas, remove or protect food and packaging, and rinse with potable water if contact is expected.

What’s included

• 1 x Viper Heavy Duty Concentrated Coil Cleaner 3.785L

What you may also need

• Viper Foam Sprayer – useful when you want a compact 2-in-1 foam and jet applicator
• Viper Foam Gun – better for hose-fed outdoor coil cleaning and fast dilution control
• Viper Brite 3.785L – better choice when oxidisation and hard deposits need brightening action
• Viper Evaporator Coil Cleaner 3.785L – dedicated indoor coil option for evaporator-focused work
• Tradie Hydrobag Split System Cleaning Bag – helps control runoff on indoor wall splits
• AC cleaning kits – for techs who want a more complete cleaning setup

Safety and handling notes

Always follow the current supplier SDS and your workplace procedures before use. Chemical handling requirements can vary by jurisdiction and application, so do not assume that older “non-toxic” marketing copy tells the whole story. Wear appropriate PPE for the task, protect surrounding finishes, avoid forcing debris deeper into coils, and do not mix with other chemicals unless the manufacturer specifically says it is safe. For any HVAC task that also involves electrical isolation, system disassembly or refrigerant handling, use competent personnel and the appropriate licensed RAC technician where required.

Frequently asked questions

Is Viper Heavy Duty a true no-rinse coil cleaner?

Not in every scenario. Supplier guidance is conditional: evaporators can be no-rinse above certain dilution levels where drain blockage will not be an issue, while condensers may still need a light rinse unless used at higher dilution.

Can I use it on both condenser and evaporator coils?

Yes. This is one of the main strengths of RT390G. It is designed for both condenser and evaporator cleaning when used as directed.

Is it safe for aluminium and micro-channel coils?

According to the supplier technical data, yes. It is described as safe for all metals and OEM approved for aluminium micro-channel coils.

When should I choose this over Viper Brite?

Choose Viper Heavy Duty when you need strong degreasing but not a brightener. Choose Viper Brite when the job involves oxidisation and hard carbon deposits that need more aggressive brightening action.

When should I choose this over the Viper Evaporator Coil Cleaner?

If most of your work is indoor evaporator maintenance, the Viper Evaporator Coil Cleaner is the more targeted option. Choose Heavy Duty when you want one stronger concentrate for mixed condenser and evaporator jobs.

Do I need a special applicator?

No special applicator is mandatory, but the product is much easier to apply consistently with the Viper Foam Sprayer or Viper Foam Gun.

Can homeowners use this?

It can suit informed DIY cleaning tasks where the user understands safe chemical handling and the equipment being cleaned. For larger systems, electrical work, heavy fouling, or any work involving refrigerant circuits, use a qualified technician.

Can I use it in food-processing areas?

Supplier directions say food and packaging should be removed or protected, and potable-water rinsing is required if contact with food or packaging is expected.

Helpful references

• Official SuperCool Viper Heavy Duty product page
• Official RT390G technical data sheet
• Australian safety data sheet
• Safe Work Australia – using safety data sheets
• WorkSafe Queensland – hazardous chemicals and dangerous goods