Get a sand blaster
I have recently undertaken rebuild of my escort.
Among the many handy tools i have acquired including my rattle gun :-), has been a sand blaster.
$14 from supercheap (and a rather more expensive belt driven hi volume air compressor)
It is one the best things ever.
Sand blasted all engine bay tricky bits, underside of doors, strut towers, rusty wheel hubs, twind side draft webbers and manifold.
It is just fantastic!!
Source a good place for you garnet powder thats cheap - not supercheap!! @$20 10kg.
Good luck - have a blast [(#)]