The internet is full of advice recommending putting electronics in uncooked rice. Here is why doing this to a MacBook makes damage worse:
Rice cannot extract moisture trapped under BGA chips and silicon heat sinks. Meanwhile, the starch and fine dust from rice mix with the liquid to form an acidic glue that speeds up trace corrosion. Professional repair centers use high-frequency ultrasonic tanks with specialized chemical solvents to clean boards within hours of a spill.