You can use the spray cleaner while working from a ladder -- although scaffolding is better -- but practice at ground level first; the force of the spray against the house could knock you off a ladder if you're not careful. Some of these machines come with separate containers you can fill with cleaning solutions or anti-mildew solutions. Sprayers are so powerful that ordinarily you probably won't need to use a cleaning solution; if you do, remember to rinse the surface with clean water afterward.
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Next, undercut the trim to create a gap (Photo 3). When you’re done, scrape any dirt or gunk out of the gap with a putty knife and blow out the dust using a vacuum or air compressor. To avoid staining the concrete, run at least three layers of masking tape under the wood. Apply repellent to all bare wood (Photo 4) including the underside (Photo 5). Bend a putty knife in a vise to make a handy tool for reaching into tight areas. Remove the tape right after application.
The time needed to complete an exterior paint job varies depending on the size of the home, the condition of your home’s exterior, the weather conditions and type of paint used on the job. An average project lasts 3-4 days, while a complex project may take a week or more. Additional time may be needed to fix loose or damaged siding or add primer to areas without coverage. Your painter will provide a timeline that explains how long the project will last and will schedule the job to avoid inclement weather.