Several methods were examined for efficacy in removal of carbaryl and chlorothalonil contamination from indigo-dyed cotton twill, undyed cotton twill, polyester/cotton broadcloth, and cotton weft knit terry. Fabrics were contaminated with commercial formulations of carbon-14 labeled carbaryl and chlorothalonil, as well as pure carbaryl and chlorothalonil. Vaporization of the pesticides over a 21-day period resulted in a loss of up to 35% of the carbon-14. A hydrocarbon-based dry cleaning solvent was ineffective in removing the pesticides, while a perchloroethylene-based solvent removed ≥76% of the pesticides. More of the pure form of the pesticides was extracted than the formulated form. Repeated extraction with warm water removed 80 to 98% of the pesticides except for pure chlorothalonil of which 40 to 60% was removed. The inert ingredients in the commercial formulation of chlorothalonil appear to increase the efficiency of aqueous extraction.
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