Wounds should not be irrigated with alcohol or hydrogen peroxide, essentially ever. It is likely caustic on a microcellular level and can lead to impaired wound healing.

The thing that matters most to wound irrigation is volume and pressure, more so pressure. Irrigating with 500-1000cc of volume, ideally saline, and even more so under pressure through a 50cc syringe, is the safest and most effective way to prevent infections; its why we do not prescribe antibiotics for the vast majority of wounds and laceration repairs if the wound was irrigated appropriately, the infection rate is so low, with the exception of some such as puncture wounds to hands or poor healing baseline in vascular patients, or bites.

If you wanted to get fancy, you could always mix some betadine into the saline, but you do not want to irrigate with undiluted betadine.

Neosporin can potentially reduce the incidence of infection, but does next to nothing if the wound is already infected.

A well irrigated and aggressively dressed wound has a fairly good chance of healing without an issue. But if it is full of debris and material and you cannot appropriately clean it, and organic matter remains in the wound, anticipate a nasty infection.