-Most anything works. If you have the ventilation, just use some diesel or kerosene, and some rags. (Wear gloves, eye protection, keep a fire extinguisher handy, you know the drill.) It's cheap and it works.
Water-based stuff works too, just keep an eye out for water infiltration into seams and nooks, where it can cause rust. A post-cleanser blast of WD-40 works too.
If anything's rusty, use WD or kerosene, and some 3-0 or 4-0 steel wool. For nonprecision surfaces, like the front of the table, fine Scotchbrite works like a champ.
Once the top of the table is cleaned, check it for nicks and dings- it looks like there'll be plenty.

Use a fine honing stone, like you'd use to sharpen a pocketknife, to 'stone' the nicks and dings down.
-Be
extremely careful when using a drill press vise in the mill. They do NOT have the holding power or rigidity of a proper mill vise, nor the accuracy. I very strongly do NOT recommend using it with your mill- and I say that with the voice of experience. I used a cheap drill-press vise in a mill-drill for several years. It worked, as long as I was very careful with it, but it also cost me some broken cutters and more than a few spoiled jobs.
Grab a cheap 4" milling vise from Enco or whoever you like. It'll cost you more than $15, but it'll be a damn sight better than a drill press vise.
-T bolts and T nuts can be had cheaply and easily off eBay too. Hold-downs are a key part, don't skimp on 'em.
Doc.