In reply to Dai Horribly:
Anything metal will be fine. Were it me I'd rinse the lot in boiled water and - ever so lightly - add a small drop of WD40 onto anything that moves; krab hinges and the like. Otherwise, if it looks fine - no frayed wires and the like - then it'll be ok.
Anything made of webbing or tape will have degraded a little, even in the dry dark of ten years - but no-one can really tell you whether it's safe or not. It's a judgement call you have to make. It's the same with ropes; you know what you did where and when with them so you should have an idea of how hard a life they've had. At the very least I'd uncoil the rope and give it an inspection by running it through my fingers and looking at it. If it looks ok, then it probably is ok; but again, it's your judgement call.
Were it me, I'd buy a new harness and plan to replace ropes, slings and tapes as I went along. Any old friends, larger rocks and hexentrics or similar that could have a rope sling threaded through instead of a tape would be the first things I'd change.
All that said, I once went away for a weekend in north Wales having been unable to get my harness and ropes out of a locked garage (long story), so I borrowed an eleven year old rope and a twelve year old Whillans harness, both of which had recently been retired after having had hard lives. Using both, that was the weekend I led my first E1.
So exercise a bit of care, remember these are your judgement calls not anyone else's and that it's you that will get bruised, broken or worse if you make the wrong call, but otherwise get yourself out there.
T.