Issue 27 of TrailGrove magazine (an American publication) includes a very good article about maintaining bushwalking gear. The topics covered include packs, leather products, down products, hiking poles, shelters, wool clothing, nylon clothing and equipment. It also includes recommendations for cleaning and repair products we ought to have. These might not be available in Australia or be known by a different name, but the principles apply generally.
You can read the article at http://www.trailgroove.com/issue27.html?autoflip=85.