Holts -EGR & Carburettor Cleaning Spray 500ml Improves Engine Performance Removes Dirt, Grease, Paint, Coal & Rubber Residue; For EGR & Carburetor Systems to Restore Engine Performance, Improve Fuel Efficiency & Reduce Emissions; Careful Blend of Powerful Solvents Dissolves Performance Inhibiting Deposits Such As Rubber & Soot and removes this. Spray directly onto the part and spread with a brush as required.