Avoid bleach because it leaves a residue. So unless you want to bleach, dry, wash, and dry again I would go for an organic cleaner for the walls and what not. H202 and rubbing alcohol are also good cleaners that you can apply once and be done.
gbauto is correct. If the environmental factor is still present (like maybe a light leak or something) cleaning the place will not be enough to avoid this same outcome for the next grow.