I'm sure I'm gonna get some pushback, but here goes...

You can add SeaFoam to your engine oil. The mechanics at my work add the recommended amount to the work trucks just before an oil change. Then drive it around the block a few times, put it on the lift and let them drain for the night. Next morning they finish the oil change with oil only.

I did this with my VTX but haven't yet with the F6B. I've been told don't waste the money because modern oil has all the cleaners you need. I will say I do let the bike drain for several hours and, intermittently, I do sit on the bike and shake it up and down on the shocks and side to side. Get's a lot more oil to run out.