Over time, the build‐up of sludge and rust can impair the performance of cooling systems. This can 

lead to blocked coolant channels and subsequent overheating and increased pressure. Silverhook 

Radiator Flush effectively clears blockages and removes any sludge and rust accumulation. May be 

used with all radiator types, and is harmless to rubber hoses and gaskets. 

FEATURES 

• Removes rust and sludge 
• Clears water channels 
• Safe with rubber hoses 
• Safe with all metals 

TYPICAL PHYSICAL PROPERTIES 

Appearance :    Clear slightly hazy liquid 

Colour:    Colourless to light straw 

Density at 20°C:  1140 kg/dm³ 

Boiling Point:   >100 °C 

pH undiluted   9 

DIRECTIONS FOR USE 

Pour the contents of the bottle into the Radiator and run engine for 10 minutes at normal working 

temperature. Turn off engine and allow to cool. When cold, drain the radiator and refill with 

recommended coolant.

Over time, the build-up of sludge and rust can impair the performance of cooling systems. This can lead to blocked coolant channels and subsequent overheating and increased pressure. Silverhook Radiator Flush effectively clears blockages and removes any sludge and rust accumulation. May be used with all radiator types, and is harmless to rubber hoses and gaskets.