so they remain in good condition, casement window must be painted regularly. Make sure to paint the exterior and interior separately though, to prevent them from sticking.
If its really bothering you and you said you have asked a lot from the owner, you can repaint it yourself. That way you can be sure its going to be lead free and you can sleep well at night, knowing you have done something about it.
I definitely agree! Make a paste out of vinegar and baking soda and use with scouring pad, leave for 15 minutes. Rinse it with 1 part vinegar and water. You'll be surprised at the result.
I'd like to know if its really worth the effort of making the panels myself. I want to make sure its effective too. I might be able to save up but how much energy can it provide?