Take it in to get it serviced. Fresh water intrusion is not a huge deal, you have not done any damage, but if any water remains in the 1st stage gets blasted into the SPG it will likely ruin it (the SPG). Other than that, fresh water intrusion may just shorten the interval between services (by removing some lubrication from internal o-rings).
A "field repair" is to remove all hoses and port plugs, put the regulator on a tank, and run air through it (tank air is super-dry, will quickly dry the first stage), then replace all hoses and again put the first stage on a tank, and purge the 2nd stage(s) to get water out of those hoses.... then you should be good-to-go until you can get it serviced.
Salt water intrusion = immediate service after the dive.
Fresh water intrusion = ASAP service, after the dive trip /vacation pehaps.... if I knew the water was 100% clean (not a dunk tank on a dive boat), I personally might skip the service after doing the "field repair" (but I do service my own regs, so I'd just keep an eye on it, and if it started to act up would just rebuild it....).
Regarding soaking.... I very respectfully disagree, Valhalla. If the reg has a good dust cap, and the cap is used properly, soaking is the single best thing you can do to keep your regulator (and most gear) happy. The key is making sure the dustcap is on properly (and not to forget to put it on).
Best wishes (and good luck with your reg.... but it should be just fine!)