Removing grease stains from washable fabrics requires pre-treatment with an agent to break up the grease, followed with a washing in the hottest cycle possible, according to DoItYourself.com. Grease-stained fabrics labeled "dry clean only" must be taken to a dry cleaner.
The care instructions listed on the garment label usually indicates the preferred washing temperature; hot cycles may damage or shrink some premium fabrics. Customers taking clothing to a dry cleaner are advised to explain the nature of the stain for the best treatment. If the fabric is washable, the stain may be treated with dishwashing liquid, a paste of baking soda and water or a clothing stain remover designed specifically for removing tough grime and allowed to rest overnight. Machine grease and oil may be treated with Pine Sol, Formula 409 WD-40 or a pine tar-based soap, advise DoItYourself.com household cleaning experts. Such cleaning agents should be tested on an inconspicuous spot or similar fabric to ensure no damage or discoloration occurs
Once the pretreatment has set, the fabric may be scrubbed with a soft-bristled brush; the fabric may then be washed in the hottest water recommended on the care instructions. After washing, the fabric must be examined and the grease stain gone before the garment is dried, as dry heat sets stains, making them more difficult or impossible to remove, warns HowToCleanStuff.net. When stains are still visible, the pre-treatment and washing steps should be repeated.