Dear David, I don't have that experience with a digital camera, but in the analogue era when a camera caught seawater, the solution to save it was to wash it thoroughly with fresh water (distilled water if possible). So I wouldn't be completely discouraged.
The first thing to do is remove the battery, which you did. The next task is to dry it completely as quickly as possible, which is not always easy. Silica helps but is insufficient. Normally, a hairdryer was used at minimum power and, when possible, the lower and upper covers were removed to allow air to circulate better. The aim is to completely dry the interior. What has been affected by contact with water, such as LCD panels, for example, and the functioning of which depends on them, will probably only be recoverable with replacement. As for the remaining electronic contacts, they usually resist better than our fears, as long as everything is kept dry.
Good luck