DISINFECTANT, SURFACE SAFE 2 STEP APPL (2/PK 15PK/BX 12BX/CS Cleans and inactivates many chemotherapy drugs. 2-Step Application Apply the towelettes to the contaminated work surface in numerical order. Treats approximately 2 square feet Packet #1 contains a towelette in a 2% (w/w) sodium hypochlorite soap solution. Packet #2 contains a towelette in 1% (w/w) sodium thiosulfate with 0.9% (w/w) benzyl alcohol.