Every product sold in the US must have whatís known as a Material Data Safety Sheet, or MSDS for short. If you google BG 44k, Seafoam, or any other similar product along with +msds (meaning "bg44k +msds") as the search argument you will find that they all contain two or more of the same chemicals: Naphtha (a solvent), Isopropyl alcohol (a solvent), and mineral spirits (a solvent.)
Hereís the MSDS for BG 44K. Note that it contains up to 70% naphtha:
You can buy a gallon of liquid Coleman lantern and camp stove fuel (128 oz) at your local hardware store for about $12, which is 100% naphtha (check the MSDS.) You can buy eight ounces of mineral spirits at your local grocery store for about $3. If you want to get 8 oz of 97% ISP itís in you grocery store for about $1.
Simply add 4 oz of each to your engine by whatever method you choose and achieve the same results as much more expensive branded products. If you google diesel fuels including MSDS in the search argument, youíll find that they contain a lot of naphtha as they run so dirty, so thereís your primary solvent.
Simple, effective, duplicative, and cheap.