Problem with carbon steel T.Issard blade. At the point of rivit there was some water left and withing 2 days saw rust appearing.

I scraped off most of it...but seems a little bit has stained the metal. Any advice on what i can do perhaps from spreading it.

I alternate my straight blade between T.Issard and Dovo. For now i dry them to best I can; and leave in sunlight for 2-3 mins to dry off any water in hard to reach places.
Still concerned a little about rust spread? Adivce be helpful. Luckly rust is not on the sharp blade itself.
~Nico.