Martin Cooper spent more than a decade cleaning some of the most prestigious vehicles in the world in the Royal fleet. During his tenure, he found a natural hack to keep interiors smelling “majestic”, without using overpowering chemical cleaning products.

He swore by a simple method that made cars smell “luxurious” using four ingredients that all cost less than £1. “I used to boil water, drop in slices or peels of fruit, and let it steep for a few minutes. The heat draws out the oils and fills the cloth with fragrance,“ he told Number 1 Plates. “Then I’d take the warm fruit or soaked cloth and discreetly tuck it behind a vent or under a seat. It gave off this gorgeous, subtle scent that lingered for hours.” 

The first fruit he relied on were limes, priced at 30p at Sainsbury’s, which he said left an “invigorating” scent.

Martin explained. “I’d boil lime slices briefly, then place the warm fruit into a breathable pouch and hide it near the footwell. One of his team once asked me if we’d changed the car freshener. We hadn’t – it was just a lime from my kitchen.”

For more formal occasions or longer journeys, Martin created what he called a “spa blend”, using a 40p orange and rosemary priced at 70p in Waitrose.

“I’d drop orange peel and a sprig of rosemary into boiling water, let it steep for five minutes, then soak a small cloth in the mixture,” he explained.

“Once it was warm and damp, I’d tuck it discreetly behind the dash or under a seat. It made the car smell clean, luxurious, and fresh – without anyone knowing where it came from.”

The next hack was bananas, priced at 24p in Tesco, which left a “subtle” and “comforting” smell. 

He explained: “I’d drop the peel into boiling water for a few minutes to warm it up, then wrap it in a cotton cloth and place it near the car’s heater vent. It created this soft, creamy warmth in the air – comforting, not cloying.”