How about good old soap and water with maybe a little bleach to kill any mold in the fabric. You could always spray paint the metal with Rustoleum if its all rusty.
I have two outdoor swings. When I clean them, I use simple mild soap and water. Last year, One was getting rusted...so I cleaned it and then used Krylon paint. It now looks brand new. Hope this helps.
Angel: I can't see the swing too well, but is mildew your problem? I wash my outdoor painted furnishings (take the cushions off) in a solution of 10% bleach to water. It won't kill the grass or plants or anything if you hose the area down after. If your furniture is coated with plastic, I was told to use an RV cleaner (I have to use this on my gutters). Works great on the black mold/mildew.
I give all my metal outdoor stuff a new coat of paint every year or two. This year I also purchased some of the FUSION paint for plastic and I was quite impressed. I heard that they are known to plug up but I think that maybe is if you try to save a partial can (??). Worth the $3.xx at walmart for me anyhow =)
