Used a 3M P100 with Multi Gas Vapor canister for this job.
"3M Multi Gas/Vapor Cartridge/Filter 60926 P100 may be used for respiratory protection from certain organic vapors, chlorine, hydrogen chloride, sulfur dioxide, chlorine dioxide, hydrogen sulfide, ammonia, methylamine, formaldehyde, or hydrogen fluoride, and non-oil and oil particulate concentrations up to 10 times the Permissible Exposure Limit (PEL) with half facepieces or 50 times PEL with quantitatively fit tested full facepiece masks. "
I can't see anyone doing this without full protection, that stuff is really quite potent.