Hi Semih ;
Senegals do not have a problem with bathing and will need to have one offered at least once a week. You do want to keep the temperature down though, As a general guide I start with cold water and add just enough warm until I don't feel the water temperature, any warmer is too much.
You now have two Senegals with a parasitic infestation, the parasites are so contagious that if one has it all birds that come into contact with them has it from that time, it only takes a second for this to happen. you need to talk to the vet and start treating both of them right away. I am sure that she loves being netted about as much as I enjoy salt in my eye. Yeah, giving medications always makes them a bit distrustful, but what can you do about it?
I saw your video and I saw the place on the males head as well as the females, other than the parasite they look good. It is always easier to get one to eat different foods if they see another parrot eating it too. Thank you for sharing the video with us.
I am not sure what you mean about making the comfortable outside the cage, it could mean many things so if you could give me an idea of what you mean, I will try to help.