TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The densified fluid comprises a near critical, critical, or supercritical fluid. The fluid comprises carbon dioxide, water, xenon, argon, krypton, ammonia, methane, ethane, propane, methanol, isopropanol, or their mixture. The antimicrobial agent a halogen antimicrobial agent, a peroxycarboxylic acid antimicrobial agent, a carboxylic acid antimicrobial agent, a phenolic antimicrobial agent, or their combination. The halogen antimicrobial agent comprises an interhalide, a polyhalide, a dibromodimethylhydantoin, chlorine, bromine, chlorine dioxide, hypochlorous acid, hypobromous acid, or their mixtures. The composition further comprises an oxidizing agent including hydrogen peroxide, oxygen, ozone, or their mixture. The peroxycarboxylic acid antimicrobial agent comprises a peroxyacetic acid, a peroxyheptanoic acid, a peroxyoctanoic acid, a peroxynonanoic acid, peroxyformic acid, peroxycitric acid, peroxyglycolic acid, peroxylactic acid, or their combination. The composition further comprises an oxidizing agent and a carboxylic acid including acetic acid, butyric acid, heptanoic acid, octanoic acid, nonanoic acid, benzoic acid, lactic acid, glycolic acid, succinic acid, and/or maleic acid. The phenolic antimicrobial agent comprises phenol, butylated hydroxytoluene (BHT), mandelic acid, and/or salicylic acid. The densified fluid comprises carbon dioxide, the antimicrobial agent comprises peroxyacetic acid, and the composition further comprises hydrogen peroxide and acetic acid.Preferred Composition: The composition comprises 1-20 parts acetic acid, 0.1-10 parts hydrogen peroxide, and 0.1-20 parts peroxyacetic acid for each 10-10000 parts carbon dioxide. It further comprises 0.01-0.9 part Dequest (TM) and 0.01-100 parts deionized water for each 10-10000 parts carbon dioxide.Preferred Method: Venting comprises employing a spray jet, an atomizing nozzle, a chilling device, and/or a directional wand. It comprises stripping antimicrobial agent from an antimicrobial composition by the densified fluid. The method further comprises contacting the antimicrobial agent with a surface of the object, transporting the object to the vessel and the vent, moving the vent relative to the object during venting or between ventings at the object, and moving the object relative to the vent during venting or between ventings at the object. The reacting step comprises adding to the vessel the oxidizable substrate and the oxidizing agent, and adding fluid to the vessel to form the densified fluid. Adding fluid comprises bringing the pressure of the fluid in the vessel to greater than 0.6 Pc, to greater than 0.8 Pc, to greater than 0.9 Pc, or to greater than 1 Pc. The method further comprises heating the vessel containing fluid to greater than 20 degrees C, greater than 30 degrees C, or to greater than 50 degrees C. EXAMPLE - A system including a densified fluid was employed for generating and delivering an antimicrobial agent. A composition including 10.52 g acetic acid, 12.2 g hydrogen peroxide, 0.36 g Dequest (TM), and 0.91 g deionized water was injected into a stainless steel reaction chamber. The carbon dioxide pressure of the system was brought to 350 bar by adding liquid carbon dioxide to fill the 100 ml reaction vessel. The system was heated to 80 degreesC and was processed for 1 hour by cooling the vessel, venting off the carbon dioxide, and measuring the gas-phase concentration of peracid, using a peracid test strip in the vented carbon dioxide. The vent gas was tested for the presence of peroxyacetic acid using a peracid test strip. Within a second of exposure, the peracid test strip registered levels in excess of 50 ppm. A densified fluid system successfully generated and delivered an antimicrobial agent. Peroxyacetic acid was produced in the supercritical carbon dioxide environment and was delivered from the system via the vented carbon dioxide gas.