These are the primary sources behind the facts on ExteriorClean HQ.
- US EPA - Stormwater / NPDES (mobile washing & runoff) - Wastewater guide, state pages
- California Contractors State License Board - CA license page
- State contractor licensing boards / secretaries of state / revenue departments (10 states) - State license pages (NASCLA as directory)
- Angi / HomeAdvisor / Fixr cost guides - Price benchmark ranges (cited)
- Sodium hypochlorite SDS (manufacturer) - Soft-wash safety notes (cite NIOSH/SDS)
- BLS OES - Earnings guides (with category caveats)
- Vendor pricing pages (Jobber, Housecall Pro, Workiz, ResponsiBid, QuoteIQ, Markate, Invoice Simple, Joist, FieldPulse) - Competitor/compare pages, date-stamped
- FieldPulse - Pricing page
- Housecall Pro - Pricing page
- Invoice Simple - Pricing page
- ResponsiBid - Pricing page
- QuoteIQ - Pricing page
- HomeAdvisor - How much does pressure washing cost (updated Jun 17, 2026)
- HomeAdvisor - Cost to pressure wash a driveway (updated Jun 20, 2026)
- Fixr - Driveway pressure washing cost (updated Jan 31, 2025)
- HomeAdvisor - Cost to clean gutters (updated Jun 20, 2026)
- Fixr - Gutter cleaning cost (updated Jan 31, 2025)
- Fixr - Cost to pressure wash a house (updated Jan 31, 2025)
- HomeAdvisor - Window cleaning cost (updated Jun 19, 2026)
- Fixr - Window cleaning cost (updated Aug 29, 2025)
- Fixr - Roof cleaning cost (updated Jan 31, 2025)
- Texas Comptroller - Cleaning and Janitorial Services (Pub. 94-111)
- Texas Secretary of State - business filings
- Florida Division of Corporations (Sunbiz)
- CSLB press release #24-21 - Handyperson exemption increases to $1,000 (Dec 30, 2024)
- CSLB - D-38 Sand and Water Blasting classification
- Office of the Texas Governor - Texas Business Licenses & Permits Guide 2026-2027 (updated Dec 2025)
- Florida DBPR - MyFloridaLicense.com
- HomeAdvisor - Cost to pressure clean a roof (updated Jun 19, 2026)