In reply to duchessofmalfi:
looking into this more, I suspect:
The nylon absorbs the IPA, softening and swelling but not changing chemically. While it is in the rope it is likely to adversely affect the performance. However, once it is dried the fibres will return to something like their original volume and structural properties.
Perhaps short exposure with proper drying (ie a decent length of time, not hot) it will be ok.
In this test:
https://www.maximropes.com/home/tech_info/covid_19_rope_disinfection/ they soaked for 3 minutes and dried for 48 hours and saw a 3-4% change in properties. I suspect you get a 3-4% change in properties in the first big fall...
The difference between "during exposure" and "after exposure" probably accounts for the different conclusions in the various sources.
I'm not sure if you'd be so happy if the rope spent a year in IPA but perhaps a short period equivalent to the hand sanitizer test you might be happy.
It's just information rather than advice. I suspect that if it were me and it was a battered fluffy rope I might chop off the wet, fluffy ends and use it at the wall or for abseiling if it was still of a reasonable length. If it was a new / good rope I'd be looking for more data... but wouldn't use while damp from the stuff.
Post edited at 17:07