Remove and store all personal items. Then remove all floor mats.
Blow dirt and debris from under the seat (forward) with an air hose.
Blow dust from the vents with an air hose.
Thoroughly vacuum the floor mats and all fabric surfaces in ...
... the interior compartment ...
... and the trunk.
Empty the ash trays and soak them in a mild General Purpose Cleaner solution.
Inspect all fabric surfaces for stains, then dry brush the areas to be treated in order to separate the fibers.
Lightly apply the Spot Remover to the stained areas, and allow it to dwell until the fabrics are deep cleaned later in the process.