Clean the Damage
This step isn’t going to be an option for everyone, but if you have the tools to take your BlackBerry apart, you can clean out any remaining damage before you try and turn your device on. Sometime the water will leave mineral deposits or corrosion behind, and by cleaning this off, you can prevent some potential short circuits. There is only a small chance that this will be effective, so don’t feel the need to run out and by the tools, but if you have them already this can’t hurt.
To open up your BlackBerry device you will need either a T4 or a T6 screwdriver, or on a few models, both. You will also need a pry stick, or just a small flathead screwdriver to pop the case open. Finally, you will need isopropyl alcohol that is at least 95% alcohol, and preferably 98% alcohol.
You will need to use different methods to open up different models of BlackBerry. You may be able to find disassembly tutorials for your specific model online. Most BlackBerrys will have between two and four screws on the outside, and two to four on the inside. Once you remove all of the screws you can see, use the pry stick to pop the device open, but be careful because some models, like the Tour, have hidden screws (the hidden Tour screws are on the front side under a panel above the LCD).
Once you get the device open, clean every part of the control board with the alcohol and a brush. You don’t have to wonder about drying it, since the alcohol will evaporate quickly, but you can use compressed air to dry it if you feel like it. Since the damage may be too small for you too see, make sure you clean every possible area. Some models, like the Curve, have a white sticker that holds the individual keys in place. You can peel this sticker back and clean underneath, since this area is prone to water damage as it sits just under the key openings.