The smart way to compensate for a small or inexperienced crew is to make sail changes and adjustments before they are necessary. If the wind is rising, shorten sail or reef before the boat is overpowered. Make sure a sheet is attached to the headsail before hoisting it, and that the sheet is through a lead. Better yet, practice reefing when it is calm. If conditions are threatening , bear away to a more comfortable angle of sail to get sorted out.
Sails are replaceable.
With a few notable exceptions, modern sailcloth is impervious to all normally encountered chemicals. Laminate adhesive can be softened by acetone, M.E.K., and similar powerful solvents, as well as immersion in petroleum-based fuels. Avoid letting your sails soak in an oily bilge. Use a mild detergent in which you wouldn't mind soaking your own hands. Do not use anything containing abrasives.