Gopro hero 4 silver Camera flooded with salt water

Hi,

I flooded the camer during a dive. It was partially flooded and I turn it off in the dive when I saw the water.

After that, it was not turning on, so I washed it with fresh water, but only on the outside and put it in rice. The camera is working again.

I was in an island withouth access to a repair place, and I am wondering whether it makes sense to open it and wash it now? is it too late? It was three weeks ago.