try a test spot with Tide laundry soap a soft brush and the garden hose. I don't think you'll need to use a pressure washer. the wetting agents in the soap should help rinse without streaking.If the mold is on your siding the tide should work well. If it's on the interior you need to disinfect with a product like Lysol and control humidityAny tips for pressure washing outdoor walls?
Rent a sprayer with large nozzle for high areas and mix ';JO MAX HOUSE CLEANER'; (found in most wal-marts) with bleach and water (1cup of JO MAX %26amp; 1 cup bleach to 2 gallons water). Spray area to be clean and let soak for approx 2 minutes than power wash. If it did not clean as good let soak for 4 min than power wash. Do not force power washer to clean by placing washer inches away from wall. It will definitely peel the paint away. Been there done that. Place wand of washer approx 18'; or more from surface. The key is to provide more cleaning solution not power. Good Luck.
I have never pressure washer painted siding, but i have used a pressure washer, i own one, all i can tell you is if was me i won't do it, i know the damage a pressure washer can do, i will advice you, to do it with a regular hose, and scrub the mold off, it will take more time but it will save you from repainting the siding if it gets damage, good luck
Rember
18+ experience on house remodeling
I had the green mildew problem too. A couple days ago I took a pump up sprayer and mixed bleach and water 50/50 and sprayed it. This kills the mold/mildew. Carfeul with a pressure washer you can strip the paint off if you get too close.
Get a garden hose and some biodegradable soap.
Make sure you wear some kind of eye protection when doing that job.
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