Hydrogen peroxide vs bleach: Which is better for cleaning?

Using bleach or hydrogen peroxide can be your shield against disease-causing bacteria. But it’s important to know that while both are powerful germ-killing cleaners, they have their own safety considerations and chemical composition.

Make an informed decision by learning how these two popular household disinfectants differ in this hydrogen peroxide vs bleach guide.

What is hydrogen peroxide?

Hydrogen peroxide is a versatile, colourless liquid with a chemical formula of H2O2, meaning it comprises two hydrogen atoms and two oxygen atoms. Compared to water, it has a unique chemical structure due to having an extra oxygen atom that reacts quickly with bacteria and germs, damaging their cells and making them harmless. This is why hydrogen peroxide is used in various industries, such as cleaning, healthcare, and wastewater treatment.

What is bleach?

Bleach is a powerful chemical that whitens, disinfects, and colours surfaces. It contains antimicrobial properties, helping kill pathogens like bacteria, fungi, and viruses. However, bleach is also a potent oxidising agent, causing colour fading and unsightly yellow stains on clothes. 

What is bleach made of? Most household chlorine-based bleach is made of sodium hypochlorite. It produces hypochlorous acid and ions when diluted in water, which is responsible for killing germs and breaking down stains. 

You can also find additional ingredients in bleach, such as:

• Sodium chloride (for increasing the viscosity and consistency of the mixture)
• Sodium carbonate (for improving the efficacy in removing greasy stains)
• Polyacrylic acid (for stopping dirt from sticking back onto clothes when washing them)

Bleach vs hydrogen peroxide: Which is more suitable for your cleaning needs?

Keep reading to discover how hydrogen peroxide and chemical bleaches work differently as we break down their unique characteristics. 

In terms of cleaning effectiveness

Sodium hypochlorite or bleach is a more effective cleaner and disinfectant due to its strong oxidising power. When you apply bleach on surfaces, the acid disrupts the molecular structure of cellular organisms and pigments. This is how oxidising bleach works to kill germs and remove permanent stains. 

Moreover, bleach leaves residual chlorine on surfaces, prolonging its disinfecting effects. 

Although a powerful disinfectant, hydrogen peroxide quickly loses effectiveness when exposed to light and high temperatures. So, avoid direct sunlight exposure when applying hydrogen peroxide on clothes and surfaces. 

In terms of safety

Cleaning with hydrogen peroxide is safer than bleach because it breaks into oxygen atoms and water, which are natural substances, after use. However, they may cause skin irritation when used at higher concentrations, so practice caution when handling these cleaners.

Meanwhile, chlorine bleach can be harsh and corrosive because it contains potent oxidising agents. It also releases toxic fumes that can irritate your eyes, skin, and lungs when mixed with other chemicals, such as ammonia. So, when using chlorine bleach, professional domestic cleaners and homeowners wear gloves and a mask to avoid health hazards. 

In terms of material compatibility

Generally, hydrogen peroxide is more compatible than bleach for washing certain clothes, especially those sensitive to harsh laundry detergents. Unlike chemical bleaches, it’s less damaging to textiles and fibres and does not cause colour fading and bleeding. 

Although oxidising bleach is effective in removing stains and whitening fabrics, it can be harsh on other fabric materials like spandex, wool, silk, leather, and rubber. 

As for cleaning hard surfaces, such as floors, walls, mirrors, bathroom fixtures, and other household surfaces, chlorine bleach and hydrogen peroxide are generally safe to use. 

However, keep in mind that these disinfectants are incompatible with some metals. Hydrogen peroxide cleaners don’t work effectively on surfaces made of zinc, brass, copper, or silver, while chlorine bleach isn’t compatible with stainless steel and aluminium.  

In terms of environmental impact

If you want to help reduce environmental pollution, use hydrogen peroxide bleach for cleaning. It’s more eco-friendly because it’s a biodegradable disinfectant that decomposes into water and oxygen atoms. 

Meanwhile, chlorine-based bleach releases pollutants such as dioxins and forms organochlorine compounds that can harm the environment. If chlorine bleach reaches water systems, it can react with the organic compounds found in soil and water, producing toxic disinfection by-products (DBPs). 

In terms of cost

Both household cleaning products are affordable, but their cost may vary based on concentration and brand. A standard 500 ml bottle of 3% hydrogen peroxide can be as low as $19, while the same volume of household bleach can be as low as $4.

Liquid bleach is slightly cheaper than hydrogen peroxide because of its widespread use in household and industrial settings. Note that hydrogen peroxide is often sold in smaller quantities than bleach, which might affect the overall cost per use. 

In terms of cleaning application

Chemical bleaches are more difficult to apply because standard chlorine-based cleaners have a 5% to 9% concentration level. This is higher than a hydrogen peroxide solution’s standard 3% concentration level. You must adequately dilute chlorine bleach with water before using it for house cleaning and sanitation.

As mentioned, hydrogen peroxide usually doesn’t leave toxic residue. This eliminates the need to rinse surfaces right after using them for cleaning and sanitising.  

In terms of shelf life

Bleach and hydrogen peroxide lose their potency and effectiveness within six months to a year after opening them. 

However, hydrogen peroxide has a generally shorter shelf life than chlorine bleach because the decomposition process is accelerated by exposure to light and heat. As such, hydrogen peroxide is sold in opaque spray bottles to protect the mixture inside.

As for chemical bleach, you only have to ensure it’s properly sealed and stored in a cool, dark place to prolong its shelf life.

Achieve a thoroughly clean and sanitised home with Airtasker

Prevent accidentally ruining your clothes and corroding surfaces by hiring local cleaners at Airtasker. As cleaning experts, they can provide a thorough house cleaning service to keep your home safe and germ-free! Plus, with their knowledge and experience, they can advise you on the right household cleaner to use. 

Hiring a Tasker is easy! Just sign up for free, post a task detailing your budget and preferences, and wait for Taskers to give proposals.