Re: Jib sheets stiff
They get stiff from wear and being loaded, but mostly the stiffness is due to salt and dirt in the lines. I was all my running rigging in the tub a home with fabric softener and it does help.
Doesn't hurt the line either. Some looser braids can come apart if washed in a machine. I'd stick to the tub method.
Another thing to try, is coil your lines in a figure 8 so you're not putting twist into them.
Merit 25 # 764 "Audrey"