I have had several of my boars neutered recently by the same, very experienced vet. The area is shaved and there are two small wounds, one on each side with small neat stitches. In almost all cases, the stitches have fallen out by themselves (I only had one where they had to be removed). I didn't use any kind of disinfectant with any of them and just kept them on vet bed for the first few days to make sure bedding didn't get into the wounds. You need to look out for swelling, inflamation and lumps. The main complication with neutering is abscesses, which can occur weeks after the op. Hibiscrub is fine to use, if you want to, but in general I don't think it's necessary.