The invention relates to a composition for killing ectoparasites and/or the eggs thereof, said composition containing a volatile, unpolar, organic solvent that is liquid at room temperature, between 1 and 10 wt. % of at least one spreading agent, and between 35 and 65 wt. %, respectively in relation to the whole composition, of at least one polysiloxane having a viscosity higher than 90 cSt.
