News & Press

Dr Duffer Explains to NGA Glass Issues – Part 1

By International Window Cleaning Association
Monday, February 25th, 2019

First part of Dr Duffer’s talk about Glass Issues at the NGA Conference.

Categories : News and Press

International Window Cleaning Association
P.O. Box 2092 | Maryland Heights, MO 63043 • 800.875.4922 (Call) 314.239.3907 (Text)

The 2021 IWCA Annual Convention & Trade Show is January 25-30, 2021! Register