Dissolve Citric Acid in hot water and add sodium carbonate slowly with mixing until effervescence ceases. Stir in the EDTA and then the alkyl sulfate until a uniform suspension is formed. Bring temperature to 50'C. and stir in the sodium sulfate. The resultant creamy mass is stirred while cooling to form solid lumps. Make a stock 8% solution of above and dilute 1:10 for use. Apply at 70'C for 15-60 min.
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