There are zillions of lofts who will professionally wash and repair sails. I’d recommend shipping it to the nearest local loft that offers cleaning and repair services. They will use professional strength cleaning solutions and a large soak tub. It’s pretty expensive to ship a mainsail across
While cleaning and repairing is definitely a good thing, putting new resin on stretched out sails isn’t, IMO. It’s more expensive than what most lofts offer, and while it makes the sails look like new and white, they are still just old and white. recoating the cloth with resin does nothing to restore the shape to like new. The only thing that will restore shape is recutting the sail. Adding extra resin adds additional UV resistance, but does nothing to restore the strength of the fibers in the cloth if they are already weakened and stretched out.
Judy B
Sailmaker