Search:

No need for steel wool and WD-40.

As for paste, Chromium Oxide.
.5 micron. ( Razor grade )

Don't clean in the closed position, open and protect the edge with tape , as described.

They look...

More than likely.
But as long as the edges are clear of rust or chips, a pasted, and leather strop. May be all they need. Maybe just a leather stropping is all they need.!

Yes, pics would help us evaluate the situation for each Razor.
As for the crusty bump, a SE razor blade, will cut it off without scratching the blade.

Start with the least evasive things, first....