for the record .. what cause the crash
forward sensors ? props hit the tree ? Sensors below not turned off
I read somewhere it's risky to fly under a bridge for 2 reasons 1. GPS signal can be blocked 2. wind drafts pulling downward and always the downward sensors when over water
Even if it was fresh, I'd do a rinse with distilled water, pat dry, then a quick flush with isopropyl alcohol and into the rice/desiccant.
Re flying under bridges or ceilings, I'd also be wary of being close to any overhead surface not just for collision. Ground effect will give you a natural buffer cushion when you're closer to the surface - the but it can suck onto the upper surface very quickly and once it's sucked on the throttle to drop off is LOT lower than that needed to fly, it's not a very graceful drop off.