MVS Contributor Mecheng posts how to make your own formula to approximate DIY Seafoam.
You can make Seafoam treatment much cheaper than buying it.
This is the reference I used but to simplfy it and give you more info:
Typical Seafoam application is 473mL
Therefore for a 4:2:1 ratio
- 270 ml Diesel
- 135 ml Coleman Camping Fuel
- 68 ml 99% Rubbing Alcohol
This is good info, now that Seafoam is regularly $8 for 16 ounces now.