If you’re dealing with an oily or greasy substance, you’ll need to soak it up before you can get it off. Use baking soda to sop up oily substances on fabrics, upholstery, or carpeting. For industrial-sized spills, like an oil pan that couldn’t contain all the transmission fluid from your 4x4 during routine maintenance, use saw dust or kitty litter. Let it sit for a few minutes, until it’s all soaked up. Use a shop vac to suck as much up as you can, then remove the rest using a stiff-bristled brush and suck that up too. Treat the remaining spot with a powerful cleaner designed to cut through tough grime.