When cleaning car carpets, common household items such as white vinegar, baking soda, laundry detergent, and mild shampoo can all serve as effective cleaning agents. A 1:1 mixture of white vinegar and water can break down stains and disinfect. Baking soda absorbs grease and odors-simply sprinkle it on the carpet, let it sit, then vacuum or brush it off. For synthetic fibre carpets, mix a small amount of laundry detergent or shampoo with warm water, gently scrub with a soft-bristled brush, then wipe clean with a damp cloth. Avoid strong acids or alkalis as they may damage the fibers. For sudden stains like spilled beverages, immediately blot with a cold, wet cloth to prevent dye penetration. After cleaning, always blot moisture with a dry towel and air-dry thoroughly to prevent mildew. For maintenance, vacuum carpet crevices monthly and deep-clean quarterly. Using waterproof floor mats helps minimize stain contact. Note: delicate materials like wool require gentle cleaning without excessive scrubbing, while leather sections should only be wiped with a damp cloth. Avoid direct sunlight to prevent fading. Proper selection of household cleaners combined with correct techniques can both save professional cleaning costs and maintain carpet hygiene.