Was it you had a keyboard with cider in it ? Sounds like a hell of a party
When objects have been heavily water-damaged, there are a few basic steps that apply to all objects whether books, ceramics, glass, furniture, paper, etc.
Establish a work area. Ideally, it will be on site. If not, you will have to move objects to it. The site needs plenty of workspace, an adequate water supply, and an indoor drying area that can be humidity controlled.
While an object is still wet, rinse it with clear water. A very fine, low-volume hose spray is ideal. Use soft brushes or damp cloths to clean off silt and debris. Be gentle. Avoid grinding the dirt and silt into the object. Dirt and silt is an abrasive. Over energetic cleaning will scratch an object. Dry the object with a clean, soft cloth or paper towel.
Do not, repeat, not dry objects in sunlight or other high temperature environments. Drying an object too quickly can cause it to buckle, split, or warp. Air dry objects indoors where you have some control over the temperature and humidity.
If you transported the objects from the site to the work area in plastic bags, remove them from the bags as quickly as possible. In fact, do not seal them at all. Keep the bags open to allow air to circulate. These steps are designed to prevent mold from forming.
The development of mold and mildew are major concerns. Use these steps to delay or hopefully to prevent their occurrence:
(1) after determining which tact is needed, increase airflow using fans, open windows, air conditioners, or dehumidifiers
(2) provide moderate exposure to light (which kills some mildew) by opening window shades or leaving lights on.