2 knobbly transistors in Electronizes - one does motor power, the other works the relay to give reverse. A wet Electronize will have gained one of Mother Natures' home made circuits which usually results in one or both transistors switching on. If its just the motor transistor, it runs continuously, if its the relay operating transistor, it only works in reverse, if both, it runs flat out in reverse.
Sometimes a blob of something crystalline can be seen - that's the unwanted circuit and can usually be cleaned off as Martin indicated. Don't use Vodka - it does leave a deposit - save it for later, if the cleaning didn't work. As long as it didn't cause any other damage, only a test will tell.