Overnight vinegar hack: If your kitchen still smells of last night's dinner the next morning, this trick could help remove odours without using chemical sprays

Unpleasant household odours have a way of lingering, whether they come from last night's dinner, damp rooms or pets. While many people reach for scented air fresheners, these products often work by masking smells rather than removing them.

A simple household ingredient, however, may offer a more natural solution. According to guidance from environmental and academic organisations, white vinegar can help neutralise certain odours by reacting with the compounds responsible for unpleasant smells, making it a popular low-cost alternative to synthetic air fresheners.

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Why vinegar is used to tackle household odours

White vinegar contains acetic acid, a mild acid that can react with alkaline compounds responsible for many everyday household odours.

Instead of simply covering up smells with fragrance, vinegar works by helping to neutralise some odour-causing particles in the air and on household surfaces. As the acetic acid slowly evaporates, it interacts with these compounds, helping to reduce lingering smells from cooking, pets and grease.

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Although vinegar has its own distinctive smell, this usually fades once the bowl is removed and the room is ventilated.

What the science says

The environmental benefits of using vinegar are supported by several organisations.

The US Environmental Protection Agency (EPA), in its guidance on Identifying Greener Cleaning Products, encourages the use of environmentally friendly cleaning products made with biodegradable ingredients where appropriate. Using vinegar instead of heavily fragranced air fresheners may also reduce exposure to certain chemicals commonly found in synthetic sprays.

Research published in Clean and Green by the University of Arkansas Cooperative Extension Service notes that many everyday cleaning and deodorising tasks can be carried out using common household ingredients such as vinegar and baking soda.

According to the publication, vinegar acts as a mild acid that helps break down alkaline substances. Since many household odours, including grease, cooking residues and some pet-related smells, are alkaline in nature, vinegar can help neutralise them rather than simply masking them.

How to use a bowl of vinegar overnight

One of the simplest methods involves pouring white vinegar into a small bowl and placing it in the room where unwanted odours are strongest.

Leaving the bowl out overnight allows the acetic acid to slowly evaporate, helping to neutralise odour-causing compounds in the surrounding air. Many people use this method after cooking strongly scented foods or in rooms affected by lingering pet odours.

While the vinegar itself may initially produce a faint acidic smell, this generally disappears once the bowl is removed.

How to make a natural vinegar air freshener

For people looking for a quicker solution, diluted vinegar can also be used as a homemade air freshener.

According to Green Alternatives to Toxic Household Products and Hazardous Waste, published by New Mexico State University, a mixture of one part distilled white vinegar to four parts water can be used for routine deodorising.

The solution can be lightly sprayed onto washable fabrics and surfaces where odours tend to linger, helping the acetic acid come into contact with trapped odour-causing compounds.

When not to use vinegar

Despite its versatility, vinegar is not suitable for every cleaning task.

Because it is acidic, experts advise against using it on natural stone surfaces such as marble or granite, as well as untreated wood, where it may damage the finish over time.

Vinegar should also not be viewed as a solution for more serious household problems such as extensive mould growth, which requires appropriate cleaning methods and, in some cases, professional treatment.

A simple, affordable alternative

As more households look for environmentally friendly cleaning methods, white vinegar continues to be a practical option backed by scientific guidance.

While it may not replace every commercial cleaning product, its ability to help neutralise everyday household odours, combined with its low cost and minimal environmental impact, has made it a trusted staple in homes for generations.

For stubborn cooking smells or lingering pet odours, sometimes the simplest solution is already sitting in the kitchen cupboard.

Inputs from TOI