So I should probably update my comments here to reflect another thread somewhere on Buzz. After more materials compatibility discussions there, I've now settled on Everclear for ropes - as close as you can get to pure ethanol. In the other thread, someone suggested this (if I could find it I'd give attribution). Apparently isopropanol isn't recommended for nylon or poly (still use it on metal stuff though) but ethanol is OK on rope textiles (I don't know the molecular basis for this). As an aside I just purchased another bottle of Everclear today and the store clerk added some interesting info when I told him it was for cleaning sap on rope. He stated that you should watch alcohols around new water based car paints too - he was having the door on his Audi repainted after using Everclear to try and remove some tar and bugs from the door exterior. On older isocyanate paints or epoxies it's fine, but maybe beware on the new water based/ low VOC stuff. Cheers all.