Abstract: Methods and formulations for controlling parasitic insect infestations, such as human lice infestations, on textiles. In one embodiment, a method includes applying an anti-parasitic formulation to a textile in need of treatment. In one embodiment, an anti-lice formulation includes an effective amount of at least one spinosyn, such as spinosad. In one embodiment, the anti-lice formulation is at least one of an aqueous suspension and an aqueous solution. The anti-lice formulation may also include one or more additional active ingredients and one or more carriers. The anti-lice formulation has parasiticidal activity when applied to a textile. For example, in one embodiment the anti-lice formulation is formulated to produce 100% adulticidal, nymphicidal, and ovicidal activity when applied to a textile in need of treatment.