Yuck! Horrible job!!
Depending how bad it is, each window could take you 15 minutes to clean.
Roughly agree with Paul about method, though I tend to spray the windows first with solution to save the water going off to fast in the bucket and to try and not get the applicator to mucked up too.
I use an Unger 4 inch knife, these fold back on themselves and can be clipped into most squeegee handles, a must if you have a lot of knifing off to do.
The stink is awful from eggs and all your stuff has to be washed out afterwards.
I would most certainly treble the price you charge for each window you have to get egg off.
Rather you than me dude!
Ian