Godan verb with 'u' ending
to use (a tool, method, etc.)
Also: to make use of; to put to use
浴室などの掃除で使われる塩素系の洗剤に酸性の洗剤などが混ざって有毒な塩素ガスが発生し、体調不良になる事故が相次いでいるとして、国民生活センターは、塩素系の洗剤は単独で使用し、使った後は水で十分に洗い流…The National Consumer Affairs Center has reported a series of incidents in which people have fallen ill due to toxic chlorine gas being released when acidic cleaning agents are mixed with chlorine-based cleaning products used for cleaning bathrooms and other areas. The center advises that chlorine-based cleaning products should be used alone and that after use, they should be thoroughly rinsed with water.