Use heptane(s) instead of hexane(s).

Hexane is a neurotoxin and a hazardous air pollutant. In the body, n-hexane is oxidized to the neurotoxin 2,5-hexanedione*. Heptane is recommended as a seamless alternative for the vast majority of cases where hexane is traditionally employed.
               
*Clough, Stephen R; Mulholland, Leyna (2005). "Hexane". Encyclopedia of Toxicology. 2 (2nd ed.). Elsevier. pp. 522–525. 

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