Subframes are a chunky piece of kit just a wirebrush and protection should suffice. The arm is actually the upper arm ( even though it sits underneath the spring.)
Plenty of threads on here about changing them. Pay particular attention to how carefully you remove the inboard bolts. Back and forth a little at a time is the way to go.
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Dave...
Lost a few stones  and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident
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