Originally Posted by thinwater
They do NOT weakent the rope, though they do reduce friction a little bit.
We have a chemical we use to see what old ropes are made from, it is an acid. If you drop a sample of rope into it and it dissolves, that usually means it is a nylon based product.
Yes there are some acid based, but very highly diluted, products you can get to clean sails
and so on but every one of them very clearly says between 5 and 15mins exposer, no longer, then wash hard with clean water
. I would think leaving them overnite would be a big call. Hope I'm wrong.