A friend with a camcorder was along for a replacement window project too small for a sub-contractor but too important for an hourly guy.
I came across a cool trick several years ago. It was after 25 years of running caulking every day. It's a pretty cool trick and has enabled me to come up with a technique that is teachable and helps others have better and better results with the looks of their caulking. I won't say no one is better, but I will say it's very tough to come up with a better end result than this will deliver. For glass cleaner I'm using one from CRL that's tough to get for the general public but they have one like it at the local box store.