Just like any other component, PCBs get dirty and require regular cleaning. Using distilled water may work well but if the process is not well done, it can lead to a myriad of problems. Also, using stronger solvents like acetone may ruin your PCBs. What happens when you choose to use acetone ultrasonic PCB cleaner is that ultrasonic vibration atomizes acetone making the PCB to become soft. However, use of detergents and distilled water can help you do a great job for you.