My mix has pressuretek's F-13 in it. See if you can make your own from scratch. Try this mix.
5 Gallons - Powerhouse/gutter cleanerStart with 3 gallons of water
6 ounces
Sodium Hydroxide32 ounces
Sodium Metasilicate64 ounces
100% Butyl Cellosolve (2-butoxy ethanol)12 ounces
Tergitol NP-9 or 16 ounces Dawn/Ajax
10 ounces
Pinesol lemon fresh and/or Isopropol Alcohol
Top it off with water to make 5 gallons. This is pretty close to powerhouse.
I substituted pinesol and/or alcohol with the sodium ethylenewhatthefu@k on powerhouse's MSDS, I don't know if your local chemical supplier has it.
MSDS - Powerhouse/gutter cleaner<1% Sodium Hydroxide
5% Sodium Metasilicate
10% Butyl Cellosolve
2oz/gallon NP-9
2oz/gallon Pinesol