When I hear "it just need some cleaning"... Well sorry to ruin your day, but there is no such a thing as "just cleaning" when water comes in.
Tracks gets eaten away, and if you don't scrape all the moisture below coating, it will happen again in short time. It is essential to solder the tracks after cleaning that were corroded, and to form new ones for theese that were eaten away. This is ideal repair for begginers, quite easy, but I spent 45 minutes for it. Quick bow thruster control panel.
