A process has been developed whereby a very dirty regrind feed from waste PET beverage bottles can be treated to give a useful commercial product. Essentially, the PET regrind is leached with a solvent, washed with water and then dried. The solvents could be tetrachloroethylene. hexane or white spirit. The PET so recovered is shown to have properties near to virgin material and can be used in many commercial applications. The highest grade of recovered PET would be that which might be used for packaging in the Food Industry. The solvent residues in such recovered material would then be of the greatest concern. It is shown that the levels of residues from this process are low, although in the case of treatment by tetrachloroethylene they are not insignificant.