Which substance is known to work well as an antiseptic?

Hydrogen peroxide is recognized for its effectiveness as an antiseptic due to its ability to kill bacteria, viruses, and fungi through the production of reactive oxygen species when it decomposes. This action disrupts the cellular components of microorganisms, making it a popular choice for cleaning minor cuts and abrasions. Its effervescent properties also help to mechanically remove debris and dead tissue from wounds, facilitating a cleaner healing environment.

While isopropyl alcohol is also a well-known antiseptic, it is typically used in higher concentrations (70% or more) for effective disinfecting rather than as a mild antiseptic for wounds. Bleach, on the other hand, is a strong disinfectant but is not recommended for use on skin as it can cause irritation and chemical burns. Vinegar, while having some antibacterial properties, is not recognized as a potent antiseptic compared to hydrogen peroxide and lacks the same broad-spectrum efficacy against pathogens. Thus, hydrogen peroxide stands out as the most suitable answer in this context.