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    • Cleans the entire cooling system
    • Removes deposits & coolant gel
    • Complete cleaning in 30 minutes or less

    We refused to make just another radiator flush. If we couldn’t develop one worthy of the Hy-per Cool name, we wouldn’t put it in our product lineup. After several significant refinements to our product formulation, what emerged from our lab was Hy-per Cool, the highest-performing radiator cleaner and flush you can buy. Hy-per Cool Radiator Cleaner & Super Flush by Rislone is a professional-grade, proven formula that effectively:

    • Cleans the entire cooling system
    • Removes deposits and coolant gel
    • Reduces overall operating temperature and improves performance of cooling system
    • Instantly neutralizes acids that cause corrosion
    • Helps prevent formulation of scales & deposits
    • Finishes the cleaning job in 30 minutes or less, no special expertise needed
    Hy-per Cool Radiator Cleaner & Super Flush by Rislone is for use in all gasoline and diesel engines. The formula also contains a premium water pump lubricant, so there is zero risk to the pump, a common complaint with other brands. Hy-per Cool has built its reputation by making high-performance products for high-demand, heavy duty and high-speed applications. We’re happy to put our name on this, and we stand by our products 100%. Hy-per Cool Radiator Cleaner & Super Flush by Rislone – whether you need a light flushing or heavy-duty cleaning, we’ve got you covered.

    Never remove radiator cap if engine is hot.

    Dosage & Directions

    One bottle treats up to 15 liter systems.

    473 mL

    Step 1. With engine off and cool, drain system.
    Step 2. Close drain and add entire contents of bottle, then refill system with water. Reinstall cap, start engine, turn heat on high, and run engine for 10 to 15 minutes. Turn engine off and allow to cool, drain system.
    Step 3. Flush cooling system and reservoir until water runs clear.
    TIP: Using a flush “T” with garden hose works best for final cleaning.
    Step 4. Refill cooling system and reservoir with manufacturer’s recommended antifreeze/water mixture. For best results add Hy-per Cool Super Coolant after flushing the system, as the metal surfaces inside the system are now cleaned and primed for optimal heat transfer performance and corrosion protection.

    Observe local laws and regulations. Where permitted, dispose of in a sanitary sewer system. NEVER pour on the ground or in a storm sewer system.


    Data Sheets

    TDS Sheet

    MSDS Sheet



    Do I have to drain my radiator first?
    Yes, per the label directions you are supposed to drain the system and install just water.

    Does Radiator Cleaner & Super Flush contain acid?
    No, and it requires no neutralizing.

    Can this be used with copper, aluminum and plastic radiators?
    Yes, since this contains no acid, you can use in old and newer vehicles with copper, aluminum and plastic radiators.

    Will Hy-per Cool Radiator Cleaner & Super Flush hurt my cooling system?
    No, it is a non-acid formula and is safe to use on all cooling system materials. It is harmless to all parts of the cooling system, including aluminum.

    What are the dosage recommendations?
    Use one 473 mL oz. bottle of Radiator Cleaner & Super Flush, part number 41240, for every 15 liters of capacity.

    The bottle froze before I was able to use it, what can I do?
    If the bottle did not break from freezing, just let the product thaw out, shake well, and use as normal.