Wash. Admin. Code § 296-878-12005
You must make sure building surfaces and fixtures are safe to be used before you begin the window-cleaning operation. This includes:
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060, and chapter 49.17 RCW. WSR 14-09-095, § 296-878-12005, filed 4/22/14, effective 7/1/14. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 02-22-027, § 296-878-12005, filed 10/28/02, effective 1/1/03.]