I pretty much do the same thing. It works albeit imperfectly for medium-small engines like snowblowers and lawnmowers which have needle carburetors and floats; but for small two-strokes like weedwhackers and chainsaws, there's no way to run the diaphragm carburetors really dry.
Tell me more about "Sea Foam." For me, it's a medium-size rambling, whitish pink rose.
SeaFoam is available at most Wally worlds. If it’s not order it off the web. I have four water craft and attest to it being effective. I use it in each tank at the start of the season. I’ll use it again if I have any fuel trouble during the season. It’s always worked. I’ll also use Marvel Mystery Oil for top end lubrication if I’m suspicious of the gasoline, particularly in my eTec since it runs too lean by design (stoopid 3-star CARB rating).