BEST DEALS THIS WEEK

10 Best Car Radiator Flush And Cleaner - September 2026

19M consumers helped this year.

Last Updated: 08-09-2026

1

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

9.8

9.8

CHECK PRICE

Show More

MORE DEALS (1)

2

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

Prestone

9.6

9.6

CHECK PRICE

Show More

MORE DEALS (1)

3

- 12%

LIQUI MOLY Radiator Cleaner | 300 ml | Cooler additive | SKU: 1804

LIQUI MOLY Radiator Cleaner | 300 ml | Cooler additive | SKU: 1804

Liqui Moly

9.5

9.5

CHECK PRICE

Show More

MORE DEALS (1)

4

- 15%

Wynn's Radiator Flush - Compatible with All Coolants Including OAT - 325ml

Wynn's Radiator Flush - Compatible with All Coolants Including OAT - 325ml

Wynn's

9.2

9.2

CHECK PRICE

Show More

MORE DEALS (1)

5

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

9.1

9.1

CHECK PRICE

Show More

MORE DEALS (1)

6

Castrol Radiator Cleaner 250ml

Castrol Radiator Cleaner 250ml

Castrol

8.8

8.8

CHECK PRICE

Show More

MORE DEALS (1)

7

- 15%

Wynn's Radiator Flush - Acid-Free Dual Action Formula Removes Rust, Scale, Oil & Deposits - Compatible with All Coolants including OAT - Safe for Rubber Hoses & Metal Parts - 325ml (Pack of 2)

Wynn's Radiator Flush - Acid-Free Dual Action Formula Removes Rust, Scale, Oil & Deposits - Compatible with All Coolants including OAT - Safe for Rubber Hoses & Metal Parts - 325ml (Pack of 2)

Wynn's

8.6

8.6

CHECK PRICE

Show More

MORE DEALS (1)

8

- 12%

Liqui Moly 1804 Radiator Cleaner 300ml (Pack of 2)

Liqui Moly 1804 Radiator Cleaner 300ml (Pack of 2)

Liqui Moly

8.4

8.4

CHECK PRICE

Show More

MORE DEALS (1)

9

Wynn's Commercial Vehicle Cooling System Flush - Compatible With OAT - 1L

Wynn's Commercial Vehicle Cooling System Flush - Compatible With OAT - 1L

Wynn's

8.2

8.2

CHECK PRICE

Show More

MORE DEALS (1)

10

LIQUI MOLY Pro-Line Radiator Cleaner | 1 L | Cooler additive | SKU: 5189

LIQUI MOLY Pro-Line Radiator Cleaner | 1 L | Cooler additive | SKU: 5189

Liqui Moly

8.1

8.1

CHECK PRICE

Show More

MORE DEALS (1)