Part of Recommended Outdoor Gear by Mark Verber
Mildew: First, kill the mold with a solution made from one half-cup of Lysol mixed in with a gallon of hot water. Then, rinse the material with a solution comprising a gallon of hot water mixed with one cup of lemon juice and one cup of salt. Allow the tent to dry, then soak the stains in another batch of the lemon/salt/water solution, which should get them out. Rinse thoroughly and allow to air dry.
Holes in Sil-Nylon: Check out http://www.owareusa.com/TipsandGear%20Lists.html
Removing Pine sap from nylon: Without destroying the nylon. Rubbing alchohol.