This last tuesday while washing the boat the motor decided to trim itself up. It just kept trimming up and i could play with the switch on the motor and it would stop for a moment and trim itself back up. This boat has a switch on the motor, throttle handle and one on the bow. At the time i had just finished washing the motor and already washed the others earlier. I had the wife hold the switch in the down position on the motor and went and trimmed it down with the bow switch. After that it hasn't done it since. I'm just wondering if you guys have ever seen a common problem of this nature when it comes to the pump, motor trim switch, and or anything else? I haven't the time over this weekend to play with it so as soon as next week rolls around i'm going to try an make it rear its ugly head again while i have the tools out to find it. Or should i just not wash the boat anymore? It is on a 2005 90hp mercury elpto.