Use fabric starch, because pesticide residues have been shown to cling to the starch and are removed in the subsequent wash cycle when the starch is washed away. Starch also inhibits some penetration of the pesticide into the cotton fiber of protective clothing. Re-wash the protective clothing two or three times if necessary. Multiple washings draw out additional residues. Thoroughly rinse the washing machine when done laundering by running the machine through a complete cycle, using hot water and detergent.
Line dry the protective clothing as many pesticides break down in sunlight.
Do NOT dry clean protective clothing, and do NOT put it in the dryer. Toxic levels of pesticides can build up in the dryer over time. Clothing that is thoroughly saturated or contaminated with highly toxic pesticides should be discarded. If all these steps sound a bit cumbersome, another approach is to use disposable protective garments made of materials such as Tyvek. Proper use of phosphine is critical to successful management of insects in stored grain.