I recently acquired a 30L1 that obviously belonged to a smoker. I was able to clean the case with dish washing soap + water and that got rid much of the brown staining. My problem is the hole perforations are still full of nicotine, any recommendations for removing nicotine from these thousands of ventilation holes ? I decided not to clean the chassis because I was afraid to introduce water near any HV circuitry. The chassis is not as bad as the case, but I am open to any cleaning suggestions that don't involve removing any components.