Window tracking, what to charge?

Hi all, 

after many years I have just been asked to clean window tracking and I have no idea on price! What would you guys charge ? 

Not something I'd be interested in doing unless it was for what I'd call a premium customer. Doubt you could charge enough to cover the grief you'd  get. I think there's a few YouTube videos on how to do it.

Had a one off window clean the other day. Customer that booked (the wife) wasn’t in but the son and husband were. Husband came out and said she asked for the tracking to be cleaned as well “while we were there” not a chance I was going to entertain that idea haha