(OP) I'm not talking about disinfecting, which is specifically a chemical process, just cleaning/flushing, which is a mechanical one. Cleaning is by far the more important of the two in wound care. Saline is a very weak antiseptic, and isn't really better than copious amounts of tap water with a decent amount of water pressure, unless the water is contaminated.

If I were Matt (or his bestie), would personally stockpile Betadine (povidone-iodine, which can be bought at the drug store or farm supply store without a prescription) over saline. Thoroughly clean the wounds with water first, then treat with a light wipe (or spray) of dilute Betadine to disinfect.