In the southern Brazilian city of Caxias do Sul, nutritionist Camila da Rocha watched black mould bloom across her bathroom ceiling and skirting boards just three months after moving from Porto Alegre. The winter cold forced her to keep windows sealed, and a dense green area outside the apartment blocked sunlight, trapping moisture indoors. For da Rocha, who has lived with asthma and severe allergies since birth, the fungus was not an aesthetic nuisance but a direct threat to her respiratory health. Her search for a remedy—she would eventually consult a chemical engineering professor who recommended alcohol vinegar, bleach, and rigorous ventilation—mirrors a wider shift in domestic practice unfolding far beyond Brazil’s Serra Gaúcha.

Across Latin America, Southeast Asia, and parts of Europe, households are turning away from commercial chemical cleaners and embracing homemade alternatives built from kitchen scraps and pantry staples. In Argentina, economic pressure and a growing ecological consciousness have fuelled a surge of interest in what local media call trucos caseros: used coffee grounds tipped into toilets to absorb odours, though experts note the effect is purely aromatic and does not disinfect; lemon peels, cinnamon sticks, and olive oil left to steep in a glass jar to create a natural room fragrance; banana skins blended with bicarbonate of soda and water to form a mild abrasive paste for countertops and flower pots. In Indonesia, practical tips for removing deodorant stains with baking soda and lemon juice circulate alongside football predictions, signalling a readership hungry for frugal, low-toxicity solutions.

The logic behind these preparations often rests on simple chemistry. Bicarbonate of soda acts as a gentle abrasive and deodoriser; acetic acid in vinegar dissolves limescale and grease; citrus peels contain limonene, a natural solvent. Yet the effects are frequently superficial. Coffee grounds do not kill bacteria, and the much-touted combination of bicarbonate and vinegar produces a brief, satisfying fizz of carbon dioxide that can help dislodge grime but quickly neutralises into water and sodium acetate, losing all cleaning power if stored. In Caxias do Sul, the engineering professor Camila Baldasso stressed that while alcohol vinegar can be sprayed neat onto mould, it requires protective gloves and masks, and bleach remains necessary for porous surfaces. The appeal of these kitchen-cupboard remedies, then, is as much about perceived control and ritual as it is about measurable efficacy.

What unites these practices is a desire to repurpose waste, reduce plastic packaging, and avoid synthetic fragrances that can irritate sensitive airways. Garlic skins, normally discarded, are steeped in boiling water to create an insect-repellent spray for plants, or burned in a ceramic bowl to produce a woody smoke that neutralises cooking odours. Orange peels are boiled, then mixed with bicarbonate and salt to degrease stoves and pans. Vinegar is sprayed on door thresholds to deter ants and cockroaches, and some practitioners of feng shui use it to cleanse the “energies” of a home. These rituals speak to a quiet reimagining of domestic space as a site of self-sufficiency, where the line between kitchen and cleaning cupboard blurs.

In a Buenos Aires kitchen, a jar of olive oil, lemon rinds, and cinnamon sticks sits on a windowsill, slowly releasing a scent that is both fresh and warm. Outside, a woman shakes bicarbonate into her winter gloves before pulling them on, a small act of preservation against the damp and cold. The gestures are modest, but they trace a global arc: from a mould-stained bathroom in Brazil to a viral video in Argentina, the same impulse travels—a search for agency, frugality, and a cleaner breath of air.