Can any type of leather be processed with the laser?
You can process both genuine and synthetic leather, aka. leatherette, with the laser. Note, however, that synthetic leather often contains PVC compounds. Such materials must not be processed with the laser. There is a danger that harmful gases may be released.
How to clean a finished workpiece optimally?
One must distinguish between genuine leather and leatherette here. For genuine leather, we unfortunately cannot recommend any cleaning agents. Too aggressive cleaning agents can dry the material out or form spots. If you still want to use a cleaning agent, please try this on an inconspicuous area or even better on a test strip. Leatherette, by contrast, can be easily cleaned with a damp sponge without losing its shape.