I bought a simple cottage style plan online, got a local architect to slightly alter the foundation and seal the plan, and set to work with a shovel digging the foundation.

The house had been completely stripped of all drywall, flooring, and cabinets, yet there were no signs of mold treatment or sealing.

They complained that the windows with broken seals weren't replaced... again, yes they were.  

I wondered if they can be cleaned with something like bleach/water and dried and re-sealed?  

Just write down your goals, make a plan, and keep working towards those goals.I am currently reading "The Way of the Seal" By Mark Divine and it is a great read involving business and planning as well as personal development. 

If you do decide to paint it, the only think I have found that will seal the knots and keep them from bleeding through later is the shellac primer from Zinsser.

I've seen plenty of homes where the attic was pretty sealed up by people siding over gable vents, so maybe you've got that going on.

I've even taken an additional step and purchased smiley face stickers to seal the envelopes (cheesy I know, but this get's the letter opened).I am anxious about taking this first step, but I am also excited in what the future holds in this endeavor.Any suggestions before I mail out this Thursday??

@Richard Gaston the only way you can who,sealed a HID home is to double close, no assignments allowed as with most REO's.

A combination of scrubbing/lots of sealing primer/ozone machine might be the ticket.