Do not immerse the keyboard in any liquid -- doing so will destroy it.  
Cleaning the laptop and keyboard after a service call. Please if you can guide how many I clean the laptop body and key board after a service call. Can one use sanitizer with a tissue paper to clean the key boards. Also if there is any special spray or liquid available to clean for any dirt / dirt particles.    Also if one has to change the power adaptor for Inspiron 3421 , would it be a small pin or large pin adaptor. Many sold in market with different prices also Amazon sell has some great price discount than a dell authorised shop kindly advise on this . Thank you 
Key board cleaning and power adaptor - Inspiron 3421