What is the correct way to clean?

@amratef1 I do prefer the higher-grade (around 95 to 99 percent) isopropyl alcohol and even ethyl alcohol are the most effective cleaners for the PCB’s even the fan. Isopropyl alcohol especially will clean circuit boards thoroughly, keeping electrical equipment in top shape. Now for keyboards and other plastic parts you want to be sure you are not using anything to abrasive etc. For the keyboard make sure that you always keep it upside down and do not use anything conductive like contact spray to clean it. Use a vacuum or some easy puffs of compressed air to blow out the loose debris. Clean around the keys with a cotton swab and isopropyl/ethyl alcohol. There are all kinds of commercially available cleaners for just the plastic part. Even regular water will work on those for as long as you ensure everything is dry before reassembly.