Chlorhexidene (Hibiclens) and Povidone Iodine in the first aid aisle of WalMart are good to weaken with water for initially disinfecting a dirty wound. You can use a large syringe, a turkey baster, or an ear syringe. If you don’t have that, a kitchen sink sprayer can be used with some dishwashing liquid with a low pressure. After that I would dry it, and use antibiotic ointment.
After that I would use the Vetericyn twice a day then the antibiotic ointment again. A systemic antibiotic would be a good idea as well. Do you have any amoxicillin? You can get Fish Mox online, but it may take too long to arrive.