Just be sure to rinse the Bleach bottle very well and throw a cheap snap link on the End so you can quickly and easily find a point to anchor... before you throw it down.... The snap link should be strong enough Just in case as long as the rope is strong enough for a worst case senerio but if your using 1/2 manilla thats moot too.. think of it this way, it all the guy on the job can tie knots in the dark , smoke one handed behind they're back left handed etc.. then let em tie a good anchor knot, if not use a good snap link.. this brings to mind an incident on my job 20 odd years ago in a 3 frame Charlie Throw down the rope ! the guys down belwo with the line ready to go up the outside wall and on the upper porch, so Charlie did exactly that took an old school coiled Utility rope and tossed it down to the Guys below (yep, The entire coil) similarly I remeber calling out the 4th floor window down to the street to my partner who had gone down to get a couple hooks as we had a lot of walls to pull and guys standing around ,.. I yelled down Hey Billy, Bring Up a light too, he waved and a few minutes later he arrived walked over and handed me a book of matches.... lol Umm ok... I meant A Hand Light or something to help us see.....lol