alarm will not cut off and vehicle won't start on 1998 Toyota 4Runner

baterry was cleaned with only the negative terminal disconnected and when reconnected the alarm keeps going off and the vehicle will not start

Asked by for the 1998 Toyota 4Runner
Try this reconnect the battery ( I know the alarm will sound) then use the key to unlock the drivers door get in and try to start it. Sometimes just unlocking the car with the key works.