Bleach and aggressive washing/folding is very bad for the sailcloth. The best way to DIY wash is to lay the sail out on a clean lawn and wash with a mixture of woolite and non-chlorine bleach (oxyclean or chlorox-2). Use a soft bristle pole brush and try not to walk on the sail too much. Rinse thoroughly to remove all of the soap and let dry in the sun by turning the sail multiple times.
Personally I don't understand why it makes sense to send a sail to SailCare and spend 1/2 the cost of the sail in shipping and service when you can wash the sail carefully yourself. Maybe if the sail is very tired and you want to restore some life via resin application; but if your sail still has some crispness you might want to just wash it yourself and take it to a local loft for service.