Picked up a can of "Blaster Lawn Mower Tune-Up" at TSC. Directions: For sure starts in spring Spray for 20 seconds (3 oz.) in to spark plug hole, let stand 15 min. Start engine, carbon, gum, and varnish deposits are emulsified and removed with emissions. To keep engines tuned, Spray into carb for 5 seconds with engine running. Does anyone have any experience with this product? Does it work?