GSI Janitorial Services GSI Janitorial Services Search | Advanced Search | New Members | Coupons and Discounts | All Categories Sort alphabetically by... Name City ABM _ 112 N Altamont StSpokane, WA 99202 (509) 535-2022 Member Since: 2019 Learn More | Visit Site Goodwill Industries of the Inland Northwest _ 130 E 3rd AveSpokane, WA 99202 (509) 838-4246 Member Since: 1970 Learn More | Visit Site Vanguard Cleaning Systems _ 920 N Argonne, Ste 129Spokane Valley, WA 99212 (509) 922-1499 Member Since: 2017 Learn More | Visit Site If your business isn't here, contact us today to get listed!