What is the best way to apply the drywall after I apply the styrofoam to the concrete basement walls? Do I put up 2x4's every 4 feet and then use vertical bracing to apply the drywall? Or is there a better way?
Is there a trick to prevent concrete nails from bending trying to attach 2x4s to the concrete?
Build a standard stud wall framing using 2x3's or 2x4's on 16 inch centers, just inside the styrofoam.
You could have also installed 2x2 furring strips directly on the concrete wall but you can't do that now because the styrofoam is already there. Also, for an exterior wall, 2x2's won't leave enough space for non-porous non-mold-attracting insulation of enough R value.
With the styrofoam in place against the concrete foundation, any kind of additional insulation can be put between the studs.
When cleaning anything including baby diapers, it is better to sweep off or scrape off as much solid and semisolid material as you can first. (1) Less cleaning fluid or detergent needs to be used, (2) Less of a mushy mess which in turn means that bleaches or disinfectants will be more effective.