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。

、。

For containers that held volatile oils like thinner, leave them out for several days to fully volatilize, then dispose of them as non-combustible waste.

Literal

Thinner [things-like-など] [gen-の] volatile oil-component [subj-が] were-entering thing [regarding-については] several-days leave-out-[and-て] completely volatilize-[do-させて-from-から], non-combustible [as-として] throw-out.

Heavy technical/municipal vocabulary for waste disposal instructions. 揮発性 '(having the property of) volatility' uses the productive ~性 suffix. については '(regarding) / as for X' is the formal topic marker (stiffer than は). 放置する '(to) leave alone / leave unattended' contrasts with 捨てる 'to throw out.' 揮発させて is the causative 'make it volatilize / let it evaporate.' 不燃物 'non-combustible' is the waste-sorting category term in Japanese municipal trash systems.