Spotted discoloration on siding, masonry or another exterior surface? Start by describing where it appears, what the material is and whether the area stays damp. A cleaning plan needs more information than a stain’s color.
Three things to describe before cleaning
- 01 / MATERIALWhat is the surface?Identify siding, brick, stone, stucco, concrete or another material, including any coating.
- 02 / CONDITIONWhat has changed?Describe the buildup, how long it has been visible, and any loose, cracked or damaged areas.
- 03 / MOISTUREWhere does water collect?Note nearby drainage issues, leaks or areas that remain damp so they can be discussed separately.
Choose a method for the surface
Siding and painted surfaces
Share the material and any manufacturer care instructions. Mention peeling paint, open seams and damaged siding. Ask about a suitable cleaning method and what improvement is realistic for the condition.
Masonry and hard surfaces
Identify brick, stone, concrete or stucco rather than treating them as one material. Describe coatings, damaged mortar and stains. A surface-cleaning estimate should state what is included and which concerns need separate assessment.
Cleaning and moisture problems are different jobs
EPA’s mold guidance emphasizes moisture control. Cleaning visible growth does not solve an ongoing leak or water problem. If there is water intrusion, indoor growth or damaged building material, have that concern evaluated instead of assuming an exterior wash will resolve it. See EPA’s guidance on mold and moisture.
For an exterior-cleaning request, tell us about drainage concerns, nearby plants and access around the affected area. Do not assume that a protective coating or permanent prevention treatment is included; any additional work should be identified in the estimate.
Build a useful exterior-cleaning request
- Your property location and the surfaces you want assessed.
- Photos taken from a safe, accessible location and a description of the visible buildup.
- Known leaks, drainage concerns, existing damage and previous treatments.
- Access restrictions, landscaping and your preferred timing.
Questions about mold, mildew and cleaning
Can I identify the problem by color or texture?
Do not use this article as a diagnosis or a species identification guide. Describe the visible condition and the material. The cleaning approach and any need for further assessment should be considered for the property.
Can growth return after cleaning?
It can. Cleaning should not be treated as a guarantee that the surface will remain free of growth. Discuss recurring moisture, the material’s care requirements and a maintenance approach suited to the property.
Does exterior washing address health concerns?
This service guide does not promise health improvements from exterior washing. EPA notes that mold exposure can cause allergic reactions or irritation in some people and directs health questions to a health professional. Read EPA’s mold and health information.
Will low-pressure cleaning prevent damage?
No method should be assumed to be risk-free. Materials, existing damage, products and technique matter. Ask how the proposed method will suit your surfaces and how nearby areas will be protected.
Discuss the surfaces at your property
Review our house-washing and brick-cleaning information, then send the details of the exterior work you want considered.