Concentrated hydrogen peroxide solution is utilized for biomass, biofilm and pathogen remediation and/or sterilization, disinfection, sanitizing, cleaning and/or removing soils from spaces or surfaces. Instead of utilizing diluted low concentration and pH slightly acidic to alkaline hydrogen peroxide, the applicant proposes the use of a formulated and concentrated hydrogen peroxide solution with preferably with an acidic pH such as about 3.5 along with low levels of inhibitors and/or the addition of activators such as ozone, iron, etc. Foaming occurs in many instances identifying treatment in progress and an anti-microbial solution can provide long term protection against re-growth.