I'm in scafool's camp - for mass casualties its triage, stop bleeding, bandage, move on to next case. When you have time (and in a really bad situation you have 24 hours or more before patients can reach medical assistance), go back, and inspect the wound, clean, probably with ordinary water and the big bottle of betadine in the mass casualty bag. You may need to irrigate a wound before you close and bandage it, but as long as you aren't introducing new sources of infection most folks will be fine if you bandage them and have the next level of medical assistance deal with possible infection.

fwiw I keep 2 L of water in my car with my casualty bag (which has irrigation syringes), and an 8 oz bottle of betadine.