自然な状態の髪の毛には、油分が含まれています。

tbd

There is oil in hair in its natural state.

シンナーなどの揮発性油分が入っていたものについては数日間放置して完全に揮発させてから、不燃物として捨てます。

tbd

For things that have had contents with volatile oil like thinners they should be left for a few days to completely evaporate it before being disposed of as non-flammable waste.