The first step is to get the turtle out of the way. I am pretty sure you still have the little tank where you place the turtle when you first buy him. That tank is beneficial when you want to clean your tank. If you don’t, you can use any other container as long as it is wide enough. It is just a temporary place to place him as you clean his tank. Once he is out of the way, the next step is to remove the filter and the heaters. These also require cleaning, so you should remove them and put them in a sink for cleaning.