IRONTITE Thoro-Flush Coolant System Cleaner 16oz Powder — Restores Coolant Flow, Removes Rust & Gelled Dex‑Cool

Thoro-Flush is a concentrated 16 oz powder that dissolves rust, scale, oil, sludge and gelled Dex‑Cool to restore coolant flow in automotive cooling systems.

When cooling passages become restricted by corrosion, deposits or degraded antifreeze, heat transfer and flow suffer. IRONTITE Thoro-Flush is formulated to break down and remove those contaminants from cast iron, aluminum, brass and plastic components so you can flush them out and return the system to proper circulation. The powder formula treats up to a 6‑gallon cooling system for a single, thorough cleaning session.

How does Thoro-Flush remove stubborn deposits like gelled Dex‑Cool?

The chemistry in Thoro-Flush is designed to disperse and dissolve organic gels and inorganic scale that form inside hoses, radiators and heater cores. It loosens adhered material so a standard flush will carry contaminants away instead of pushing them deeper into the system.

• Specifically targets gelled Dex‑Cool and oxidized antifreeze residues.
• Breaks down oil and grease that collect along passageways.
• Softens rust and mineral scale for mechanical flushing to remove.

Is Thoro-Flush safe for aluminum, cast iron and plastic cooling parts?

Yes — the formula balances cleaning strength with material compatibility so it can be used on a variety of engine and cooling-system materials. It cleans without aggressive etching, helping preserve radiators, blocks, heater cores and plastic overflow tanks when used as directed.

• Compatible with aluminum, cast iron, brass and common plastics.
• Non-destructive when diluted and applied per instructions.
• Suitable for use before a fresh coolant fill or system repair.

How do I use the 16 oz powder to flush my vehicle’s cooling system?

Using Thoro-Flush is straightforward: add the powder to the cooling system, run the engine to circulate, then drain and flush until the discharge runs clear. One bottle treats systems up to approximately 6 gallons; follow safety and disposal guidance on the label for best results.

• Add Thoro-Flush powder directly to the radiator or coolant recovery reservoir.
• Run the engine to operating temperature for the recommended time to circulate the cleaner.
• Drain, flush with water until clear, then refill with the correct coolant mixture.

What improvements should I expect after using Thoro-Flush?

After proper application and a complete flush, you should see improved coolant flow, fewer hotspots, and reduced risk of future blockages caused by leftover deposits. While performance depends on how severe the contamination was, most systems regain noticeably better circulation and responsiveness.

• Restored coolant circulation and more uniform engine temperature control.
• Cleaner radiator and heater core passageways for longer component life.
• Better preparation of the system for fresh coolant and preventive maintenance.

Who this product is for: IRONTITE Thoro-Flush is aimed at DIY mechanics, professional technicians and vehicle owners dealing with contaminated or sluggish cooling systems — especially cars and trucks with gelled Dex‑Cool or visible rust and sludge. It’s also a useful pre-treatment when replacing radiators, heater cores or performing major cooling-system service to ensure new coolant flows through a clean system.