The reproduction fuse clips have metal that is far more brittle than OEM; crimping them with a professional crimping tool often causes the crimping tabs to break. One can try to solder the wires onto the fuse clips, but you'll need a fair amount of heat.
To remove the clips, one has to put two small screwdrivers into the locking tab slots and push very hard on the fuse clip base. I just don't see this happening in the car itself. It is hard enough to do on the workbench, particularly the ACC and BATTERY clips, which contain two separate fuse clip sets.
Your best bet is to remove the harness, soak the fuse box in EvapoRust or bead-blast the clips, apply compressed air, then contact cleaner, and lastly applying Boeshield. I've had excellent success with bead-blasting and Boeshield. Occasionally, I have to tighten up the If the clips are too far corroded, I can provide good OEM clips with wire pigtails, so you'd have to splice the wires.