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10 bestRadiator Cleaner Fluidsof December 2025

112M consumers helped this year.

8% off

1

Prestone Coolant Flush, Engine Coolant Flush For Car To Prevent Problems & Maximise Performance, Car Coolant Flush With Advanced Cleaner To Dissolve Corrosion & Scale, Safe For All Engines, 1 Litre

Prestone Coolant Flush, Engine Coolant Flush For Car To Prevent Problems & Maximise Performance, Car Coolant Flush With Advanced Cleaner To Dissolve Corrosion & Scale, Safe For All Engines, 1 Litre

Prestone Coolant Flush, Engine Coolant Flush For Car To Prevent Problems & Maximise Performance, Car Coolant Flush With Advanced Cleaner To Dissolve Corrosion & Scale, Safe For All Engines, 1 Litre

Holts

9.9

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31% off

2

QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

SPI

9.8

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3

Fernox 56599 F1 500 ml Central Heating Protector

Fernox 56599 F1 500 ml Central Heating Protector

Fernox 56599 F1 500 ml Central Heating Protector

Fernox

9.7

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4

Everbuild P14 Central Heating System Inhibitor, 1 Litre

Everbuild P14 Central Heating System Inhibitor, 1 Litre

Everbuild P14 Central Heating System Inhibitor, 1 Litre

Everbuild

9.6

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23% off

5

Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100

Heatlab

9.4

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OtherRelated productsUp to 35% off

CosWarm CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating

CosWarm CW1 Central Heating System Inhibitor & Protector - Treats Upto 18 Radiators - Rust, Limescale, Sludge & Corrosion Preventer & Protection Treatment Fluid for Boilers & Underfloor Heating

Boiler-m8 Defender-2 28mm Magnetic Boiler Filter Central Heating Inhibitor and Cleaner Concentrate Pack Fluid Prevents Corrosion and Lime Scale Improves Heating Efficiency

Boiler-m8 Defender-2 28mm Magnetic Boiler Filter Central Heating Inhibitor and Cleaner Concentrate Pack Fluid Prevents Corrosion and Lime Scale Improves Heating Efficiency

Fernox 56600 500ml F3 Cleaner

Fernox 56600 500ml F3 Cleaner

Fernox F8 Super Strength Cleaner Boiler Central Heating System Sludge Remover Radiator Protector Inhibitor 500ml

Fernox F8 Super Strength Cleaner Boiler Central Heating System Sludge Remover Radiator Protector Inhibitor 500ml

6

Boiler-m8 Defender-2 22mm Magnetic Boiler Filter Central Heating Inhibitor and Cleaner Concentrate Pack Fluid Prevents Corrosion and Lime Scale Improves Heating Efficiency

Boiler-m8 Defender-2 22mm Magnetic Boiler Filter Central Heating Inhibitor and Cleaner Concentrate Pack Fluid Prevents Corrosion and Lime Scale Improves Heating Efficiency

Boiler-m8 Defender-2 22mm Magnetic Boiler Filter Central Heating Inhibitor and Cleaner Concentrate Pack Fluid Prevents Corrosion and Lime Scale Improves Heating Efficiency

Boiler-m8

9.2

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7

Sentinel X400 Sludge Remover Cleaner Boost Heating System Efficiency, Prevent Rust & Corrosion Easy to Use Formula for Cleaner Pipes & Radiators 1 Liter Bottle

Sentinel X400 Sludge Remover Cleaner Boost Heating System Efficiency, Prevent Rust & Corrosion Easy to Use Formula for Cleaner Pipes & Radiators 1 Liter Bottle

Sentinel X400 Sludge Remover Cleaner Boost Heating System Efficiency, Prevent Rust & Corrosion Easy to Use Formula for Cleaner Pipes & Radiators 1 Liter Bottle

Kudos-Trading

8.9

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8

Holts Speedflush Coolant Flush, Universal Car Radiator Flush, High Performance Coolant Flush For Radiators & Cooling System, Quick & Easy To Use, Prevents Overheating, Suitable For All Cars, 250ml

Holts Speedflush Coolant Flush, Universal Car Radiator Flush, High Performance Coolant Flush For Radiators & Cooling System, Quick & Easy To Use, Prevents Overheating, Suitable For All Cars, 250ml

Holts Speedflush Coolant Flush, Universal Car Radiator Flush, High Performance Coolant Flush For Radiators & Cooling System, Quick & Easy To Use, Prevents Overheating, Suitable For All Cars, 250ml

Holts

8.7

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9

Boiler-m8 Defender-2 22mm Magnetic Boiler Filter Central Heating Inhibitor and Cleaner Concentrate Pack Fluid Prevents Corrosion and Lime Scale Improves Heating Efficiency

Boiler-m8 Defender-2 22mm Magnetic Boiler Filter Central Heating Inhibitor and Cleaner Concentrate Pack Fluid Prevents Corrosion and Lime Scale Improves Heating Efficiency

Boiler-m8 Defender-2 22mm Magnetic Boiler Filter Central Heating Inhibitor and Cleaner Concentrate Pack Fluid Prevents Corrosion and Lime Scale Improves Heating Efficiency

Boiler-m8

8.5

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10

LIQUI MOLY 5189 Pro-Line Radiator Cleaner 1 Litre - Black

LIQUI MOLY 5189 Pro-Line Radiator Cleaner 1 Litre - Black

LIQUI MOLY 5189 Pro-Line Radiator Cleaner 1 Litre - Black

Liqui Moly

8.2

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