Thanks Siooss! Looks like you need 2 bottles for each time with the 36gal tank. I'll order some and give it a try
Check the ingredients in the product's SDS.
The active ingredients which help remove the deposits are chemicals known as Polyisobutene(PIB), Polyisobutylene Amine (PIBA) or Polyetheramine (PEA), with PEA being the most effective.
Amsoil P.i. contains PEA.
PIB removes water from system and keeps new deposits from forming. Does not remove existing deposits.
PIBA cleans the fuel system and removes any existing deposits. Requires less frequent applications than PIB cleaners.
PEA is the strongest cleaning agent available in fuel additives. It is more effective than both PIB and PIBA.