I am NOT a doctor, but Mary's son in law is correct regarding irrigation of deep wpounds.
A very experienced military trauma surgeon wrote this on the PCT_List forum in 2011 in response to a hiker's question regarding the wisdom of using stitches (by a non-medical person) for wound closure in the field, and subsequent wound care. Note that I'm quoting only selected parts of his lengthy and valuable post.
"-Bleeding must be completely stopped. Otherwise, a pool of blood will accumulate under the skin which is a perfect "petri dish" for an infection. A slow "ooze" can really mess this up."
"-The wound must be lavishly flushed with fluid. This would be measured in gallons, not quarts. You would want some pressure behind it. In the ER, we use a pressure device, in the field, holding a container several feet above the wound would work. The tiniest bit of foreign matter left in a wound increases the rate of infection 1000-fold."
"So, what do do? We teach never to close (by stitching or gluing(I'm not a glue fan, BTW)) a wound in the field. I never would. Leave the wound open, but covered. Clean it with plain soap and water (alcohol, bad, iodine, bad) multiple times a day. Slap some neosporin on it, cover. They will ALMOST NEVER become infected. They will heal beautifully. You can do a whole lot wrong with this technique, and things will still turn out perfectly ok."
"If one cannot manage with the open wound, then you have to leave the trail, and have the wound taken care of."
"Concepts in first aid management of wounds has evolved a lot in the last few decades, based upon increasingly good information and research. It is probably a good idea for anyone embarking on the PCT to avail themselves of a current WFA or better course, but even taking one of the free online first aid courses would be better than nothing."
I've had more than one doctor tell me that a good irrigation syringe (20 ml capacity or larger) is a vital part of any field 1st aid kit. I've carried one for years and have had to use it once. They weigh very little but do take up space and can not be compressed. Google "irrigation syringe" for places to order if your drug store doesn't have - or can't order - one for you.
One recommendation that made good sense was to add Aqua Mira to several liters of clean water (as if you were trying to make it drinkable) ,then immediately begin using that water for irrigation. The AM will act as a mild disinfectant rather than kill tissue. The water does not have to already have been treated earlier, but must be free of debris and dirt. You want to remove debris, not add it.