Panaromic glass ceiling curtain

Hello, I cannot find a place where I can clean the panoramic glass roof curtain of my 2016 S&S CED vehicle. I have talked to many companies but they say that there is a risk of sagging on the curtain if they do. Does anyone recommend?

If it does not bother much, as they say cleaning, sagging is not a problem, it may cause the sled parts to break, it will be more annoying

Why are you going to clean it, sir?

Teacher disturbs pollution

Sir, I took it from this and removed the traces of the fountain pen on the ceiling. simple to use and hassle free.