the best way to clean the TB is to take it off and clean it, or at least use a old tooth brush and a rag to get past the blade. if your maf is inside the TB remove it before you clean it. you can use carb and choke cleaner or throttle body cleaner.

i just dumped my seafoam in the brake booster vac hose.

that hose in your pic maybe a/c related and what you saw was sweat from the line? but that would be clear fluid. aka water.