Skipping the psa handguards because they aren't worth anyones time. Also probably similar process as the rra set, so moving onto the rra set:
Starting with a dousing of clp, wipe down and 800 grit scotch brite pad, already yielding results. What u see is a thin layer of clp on the 800 grit sanded part (right).
Gonna take some time. Could probably get away with starting at a lower grit pad buttfuck it. I think I read somewhere to start at 800 grit... might matter.
Will update as I go.