It can be, but you need to do the cleaning on an overcast day (or in cool weather). The more oxidized the mobile home is the more damage that can be done. You need to complete the work in sections. Wet the section well first. If you spray the Exterior Siding Cleaner directly on the surface of a hot, dry home, the paint will come right off. We would suggest that you first test in an inconspicuous area! Only leave the product on for a minutes or two, and make sure to rinse thoroughly from top to bottom. For the Krud Kutter Exterior Siding Cleaner 32oz hose end follow all the manufacturer's directions. If using the Krud Kutter Exterior Siding Cleaner gal make sure to dilute the product properly (1 cup of product to a gallon of water).