One response to my prior inquiry provided the prior years' ListServ info below!
In the 23 years in my house, I have used the ones marked ** and generally have been satisfied.
But none did windows above the 2nd floor due to insurance limitations.
I am pursuing Wojcik Window cleaning 724-895-3536 because they advertise high-rise cleaning, so maybe insurance is not an obstacle for them.
Hope this helps anyone else with dirty windows!
Barb

HP List: 2011 July

** Joe George Window Cleaning: 412-243-7954

** Liberatore Window Cleaning:   412-824-3110     the poster used this one

** Expert Window Cleaning: 412-781-9173

** Walter Thor Window Cleaning Service: 412.782.2858

Clean and Clear Window Cleaning: 412-583-1158

HP List: 2008

A Clearvue                                    412-478-3431

** Expert Window Cleaning            412-781-9173

** Joe George Window Cleaning   412 243-7954
Mike Lutz                                       412-824-1747

Delaney Window Cleaning        412-363-6088

From: eventlady@hotmail.com
To: neighborhood@highlandparkpa.com
Subject: Recommended Window Washer List
Date: Thu, 10 May 2012 09:48:45 -0400

I would like to compile an HP list of recommended window cleaning companies
If you have a contribution based on your personal experience, please respond by Sat10May to my email address and provide:

window washing company name
contact info
type of service (indoor/outdoor/residential/commercial)
average cleaning cost per window

The list subsequently shall be shared on the HP ListServ.

Many thanks,
Barb