If I were a person considering starting a hood cleaning business and was looking at these forums I be immediately intimidated. I would think that I needed a lot more expensive equipment and specialized training than I really do. Most of the posters appear to have trailers with 3500 psi hot water machines and trucks to pull them. Along with specialized equipment like spinners, magnetic scrapers, exotic foamers and expensive certifications.
Actually you can start in this business without the big machines and trucks and equipment and certification. This may be unpopular but it is true. I use an electric 1200 psi machine, a small van and run off the restaurants hot water. Plus I reuse plastic sheeting. Another poster uses just a hose! Point is, whatever it takes to get the entire system clean, is ok to use. That means if you clean it with a rag and a scrub pad and do it right, you are in. In most areas certification is optional. For now.
I think these forums are here to help people in the business and to guide people looking to start off. Information and help.
Who Is Edward Przystas and What Is Hood Pros
When you look back at the early days of the kitchen exhaust cleaning industry in the Northeast, a name that shows up in several directories and vendor lists is Edward Przystas of Hood Pros. Hood Pros was a small commercial hood and kitchen exhaust cleaning company located in Chicopee Massachusetts. It was a hands on operation that serviced local restaurants and food service facilities with hood cleaning, fan cleaning, duct cleaning, and general exhaust fire safety maintenance.
Most of the public information that still exists points to Hood Pros operating from
82 Bonneville Avenue in Chicopee Massachusetts with a service phone number of
413 533 5238. That listing appears in multiple business directories including Manta, B2B Yellow Pages, and a Massachusetts Higher Education Consortium vendor file.
Here are the direct clickable links to the sources:

Manta business listing
https://www.manta.com/c/mml2zdy/hood-pro-s

B2B Yellow Pages listing
https://www.b2byellowpages.com/company-information/111478927-hood-pros.html

Massachusetts vendor directory (PDF)
https://www.milton.edu/wp-content/uploads/2015/07/MHEC.pdf
Some records list Edward Przystas as the primary contact with the email
hoodpro@yahoo.com. The business size was typically listed as four to nine employees with an estimated start date around 2003. There is no confirmed recent website or verified social pages which suggests the company may have stayed small or may no longer be active under the same name.
Hood Pros should not be confused with other companies in other states that have similar names. Several companies around the country use the name Hood Pro or Hood Pros. The Chicopee Massachusetts listing tied to Edward Przystas appears to be a separate and independent operation.
For those of us in the commercial cleaning, pressure washing or KEC communities, this is another example of how many small operators have built the foundation of the service industry over the last twenty years. Even without a modern online footprint, companies like Hood Pros played a role in keeping local restaurants in compliance and maintaining fire safety standards long before social media became the marketing engine of the industry.