Using the COBB x WeatherTech FloorLiner and Rear FloorLiner Set is a breeze. First, make sure your vehicle's footwell is clean. Then, simply place the front floor liners in the front footwells and the rear floor liners in the back, making sure they fit snugly. The specially designed retention system will help keep them in place. As for maintenance, if there's any mess or fluid on the liners, you can easily remove it by tilting the liner over the door sill. You can also wash the liners with mild soap and water. Just let them dry completely before putting them back in your car. Remember, these liners are designed to protect your car's interior, so keep them clean for the best results. And since they're made for 2015 - 2021 Subaru WRX and STI models, make sure you're using them in the right vehicle.