Some lighter fluid is contaminated with oils and such crappage, always evap a test sample first on a glass slide and see if it leaves oily residue of any sort, if it does, distil it first.
Pet ether is very similar in character to hexane, not 100%, but still what works with one should work with the other if its solely for extractions.
DCM or chloroform might be useful, but those two have some tendency to react with certain organics to form halogenated byproducts.