The first thing I would do is:
...Set the machine outside or at least in a very warm environment so as to fully dry out the machine. There are guys here who put motors through dishwashers in order to clean them. I am assuming that the motors are broken down, i.e., motor brushes removed and armature alike. When everything is thoroughly dried, the motor is reassembled and all is good.
In your case there may be water in the motor brush holders that is preventing them from making full or proper contact with the armature. More than likely your motor is fine, it just needs to dry out completely. If anything I would first replace the motor brushes. This is very inexpensive and fairly easy to do. Also, check that there are no blockages in the hose as a result of the water freeing some caked on dirt that now has moved on down the hose and is lodged somewhere. Since you didn't say exactly how differently the machine sounds it's hard to know exactly what is wrong.
Another area to avoid when it comes to water is the toilet! I have had it happen to me and seen it happen to others. If you go too close to the base of the toilet it is not impossible to draw water up from and around the wax ring particularly if your toilet does not have a bead of chalking around the base (which is not necessary if your toilet is installed properly).
Let us know what you find...