Hi Matey,
Welcome also.
A mild bleach in solution with any form of soap will be fine to scrub the sails with - but be sure to rinse it thoroughly with fresh
water after. Getting down on youer knees with a scrubbing brush will also help.
Not sure what the equivilent is in the US but in
Europe we find either Ciff or Jiff (same cream type kitchen cleansers over this side) do a good job in removing marks from glass before then polishing with a non slip product - and a fraction of the cost of
marine brand cleaners.
Finally if you've got any rust marks on the
hull or indeed any stainless
parts, a mix of oxalic acid crystals (you can get from a swimming pool shop) with
water (4 table spoons per gallon) and left on for fifteen minutes should see it all dissappear. Again - wear gloves and eye protection and rinse well with fresh water after.
Good luck
JOHN