What cleaning technique is often employed for porous materials contaminated by body fluids?

Extraction cleaning is the preferred technique for porous materials contaminated by body fluids due to its effectiveness in removing contaminants from deep within the fibers or structure of the material. This method typically involves injecting a cleaning solution and using suction to extract both the solution and the dislodged contaminant, ensuring thorough cleaning.

Porous materials, such as carpets, upholstery, and certain types of fabrics, can harbor biohazardous materials and pathogens, making it crucial to utilize a technique that can deeply clean the material rather than just surface-level cleaning. Extraction cleaning minimizes the risks associated with contamination by effectively removing both visible and invisible residues, thus maintaining a safe environment.

Other techniques like dry cleaning and surface scrubbing may not be adequate for porous materials as they often fail to penetrate deeply enough to remove all contaminants. Likewise, pressure washing is inappropriate for porous materials, as it can cause further damage and may not effectively sanitize the surfaces in question. Therefore, extraction cleaning stands out as the suitable choice for ensuring the hygiene and safety of porous materials in trauma and crime scene situations.