Fiber content of your shirts and blouses is very important when trying to get rid of collar soil. Oily stains tend to cling to synthetic fibers such as polyester and nylon. Once set by heat drying, these stains are fairly permanent. If your shirts are a blend that have a high polyester or other synthetic content, failure to remove the soil on the first try with subsequent high temperature drying will cook the stain, making it quite difficult, if not impossible, to remove.
Author: Jan Stone, Extension Specialist
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