My last SF treatment, I bought the new Aerosol can, not the deep creep. Since I have a Van, I removed the engine cover, and Air cleaner and fired a burst into the throttle body engine running, and got a satisfying burst or white smoke in the AP store parking lot. Without the straw it comes out like wasp spray.
I then began to drive toward home. There is a long Hill marked at 25 mph. I was spraying an occasional burst, and started hearing an ugly noise. I realized it was not my engine, but the 4 cylinder Honda with a soda can exhaust behind me and a young kid tailgating me, upset at my 25 mph approach to the hill.
So I gunned the engine and fired a continuous burst of Sea Foam into the TB. At first the engine bogged, but then it roared and I accelerated up the hill, blasting out a Spy Hunter esque cloud behind me. The Honda dissappeared within it.
While I was sitting at the traffic light at the top of the hill, I saw the Honda emerge from the stinky white cloud. The Kids inside were laughing hysterically, and foolishly they aligned their open windows with my tail pipe. So I Blasted them again, but the cloud was disappointedly not as thick. The light turned green, and I quit blowing the white smoke as I accellerated away. Further bursts produced little to no white smoke.
I stopped once at the store on the way home. With the engine Idleing, I removed the vaccuum line to the Map sensor, attached the straw to the can and emptied another 1/8 can into the intake like that. I also used the IAT and EGR vacuum lines. With 1/8 of a can left, I sprayed it strawless into the TB and stalled the engine with it, then sprayed the remaining can into the intake.
I replaced the air cleaner, vacuum lines and engine cover and went grocery shopping. When I restarted it, there was a little white smoke. Not much. I got onto the freeway and gunned it upto about my 95 MPH top speed, and when I got off at the next exit and waiting at the traffic light, I thought my engine had stalled. It was running so smoothly I could not tell it was running.
I'm a believer. I don't know if pouring the can down the brake booster vacuum line would distribute it evenly to all the cylinders. The Aerosol can sprayed into the throat eliminates that factor. I don't know about spraying similar type products down the intake.
Once when my Fuel pump quit, I used a can of TB cleaner to drive the van out of the middle of an intersection. After I replaced the Fuel pump I was getting horrible Mileage, and shortly after got an O2 sensor code. Apparently the TB cleaner destroyed the 02 sensor. Replacing it brought my mileage back to normal.
My Aerosol SeaFoam treatment has not affected my 02 sensor like the can of TB cleaner did.
Once yearly I puour a can in my tank, right before the Holidays when I fly across country for a month and leave the Van sit, but I think the aerosol introduced into the running engine is the most effective way of introduction.
It could be because Seafoam smoke is nothing but just a show or you have too much carbon which could not be cleaned with a single dose.