The active ingredients in both laundry powders and liquids are “surfactants”, also known as detergents (hence the product name). These are typically charged or “ionic” molecules that have two distinct ...
Old grease stains will likely require more wetting and more scraping to make them cooperate. For the most stubborn stains, an oil-based lubricant like WD-40 can also help push out the grease. 2.