Hi, Just sharing a little experiment. I bought a clear glass plate and polished it up. Put a few squirts of torch-lighter butane on it: it evaporated almost instantly, but left a residue behind. Later, I put a few squirts of Ronsonol lighter fluid on the clean plate. It took longer to evaporate, but when it did, there was no trace of the fluid on the plate: couldn't even tell it had been there. So, to me, it seems like Ronsonol is the winner for potential non-polar extractions.