To begin your installation please make sure you cup holders and other pockets are clean. To get the liners to "stick" and stay in place they pockets must be clean. We recommend simply using a wet rag to remove previous crumbs and spills. But you may have to get more aggressive depending on the condition of your cup holders. IMPORTANT: If you have previously used a UV protectant or interior detailing cleaner in your pockets such as Armor-All or 303 Aerospace, or have just picked up from the dealership we recommend you clean you pockets with at least 50% isopropyl alcohol to remove this residue as the mats may not "stick" and may slide around.