It's fine to use to get actual dirt out of a wound, but any hydrotherapy(squirting water into a wound) will clean that out easily. It's not fine to use in an already healing wound, as it does not discern between dead tissue or live tissue and will kill both.

Personally, soaking in plain saline will keep the area clean and help prevent infection. I just finished treating a friend's dwarf female rat for an abscess on her cheek by just flushing the wound with saline and keeping it open to air.

I've flushed wounds with chlorhexidine and betadine(not at the same time) and they are actually disinfectants and prevent bacterial/fungal growth. Peroxide.. will not.. Though it will get blood out of clothing like nobody's business!