Not only for the environment, but also the roof.Tide is a detergent and the active ingredient that addresses the roof is chlorine bleach.

That's caused by badly sealed or single pain glass & you not wiping it up when that happens.Better to use hydrogen peroxide rather than bleach when cleaning mould.

Assuming it is,  I figured I'd clean w/ bleach water or other mold killer,  put a bucket of DampRid in the closet and ask her to keep an eye on it.  

You can buy all your cleaning products from the dollar store which means you can spend about $6 for: cleanser, sponges (two in a pack), a bucket, windex and bleach (cleansing spray), and toilet bowl cleaner; that pretty much will clean your entire house/apartment for a couple of months!

(bleach the hell out of the old rotten wall studs) Make sure any of the new sister wall studs are cut properly to fit exactly between the old top plate and the new bottom plate so that they will properly transfer the building load.

Your best best for both time and money would be to primer the walls....I would recommend you clean the walls with a bleach mixture (simple wipe down prep)....then skim coat the walls in areas where it is uneven.

Regarding bleach, I have lived in the subtropics for many years and bleach is one of my main ways to stem the growth of mold.

So when I came into the house, I bought some bleach and Tilex and a stiff scrub brush and scrubbed out the tub, just thinking I'd get it as clean as possible and we'd see where we'd go from there.

The moisture - bleach - will seep into the grout slowly, all the better to perform the bleaching.  

Wash everything with bleach to kill any lingering bacteria.