Gday everyone. Much to my disappointment, a bunch of swallows moved into the end of my boom bag and have really made a mess of a brand new mainsail.
any ideas on the best way to clean this up? Any fabric has been stained badly.
thanks

Excellent. Thanks mate

A sail maker told me to try nappy san to clean mould and brown stains from sail, it worked a little bit still not 100% clean but a lot brighter
Could try it for bird ****

Whitworths specials show Starbrite sail/canvas cleaner $$12.95

Thanks everyone. Got a few ideas to try. Whatever works I'll post here. Cheers

Do not use bleach on Nylon or Laminate sails. I don't use it on any sails.
Safest wash is pure soap flakes (100% soluble) in warm water, then dry thoroughly before storing. Use your bath or a trough. Don't use detergent or anything with any grit, you are replacing salt crystals with a harsher abraisive?
If you are scrubbing, do not do it one concrete or gravel as you will clean one side while sanding the other, not good.
Oxalyic acid is ok for rust stains etc, 1 part in a 100 in warm water, then wash out.
Mildew is a bugger and hard to get out, remember if it is black it is dead, no further damage but unsightly.