They do make a smoke that's either Chocolate or Vanilla. I think Trainworld carries it. I'm not sure why people have to clean off their engines since the real ones are always dirty.
As far as dummy units go, the expense of putting on smoke units and lights exceeds the cost of an Anniversary complete chassis wired and ready to run. When I upgraded two old Ten Wheelers, I ordered the rods that go from the smoke box to screw into the plate the cow catchers screws onto. Don't forget to order right and left and the screws. Bachmann parts online has a sale on chassis for $55.00 this month. For an old Ten Wheeler, you will want to either get a new boiler front with both switch cut outs or just cut one out yourself with a drill or Dremel like I did. A lamp housing with light and wiring costs $8.00 and a smoke unit with mount is $10.00. The smoke unit mounts to the middle lug on the smoke switch and the other wire to the on side of the switch. The lamp wires go to the middle lugs on both sides of the other switch.
As far as dummy units go, the expense of putting on smoke units and lights exceeds the cost of an Anniversary complete chassis wired and ready to run. When I upgraded two old Ten Wheelers, I ordered the rods that go from the smoke box to screw into the plate the cow catchers screws onto. Don't forget to order right and left and the screws. Bachmann parts online has a sale on chassis for $55.00 this month. For an old Ten Wheeler, you will want to either get a new boiler front with both switch cut outs or just cut one out yourself with a drill or Dremel like I did. A lamp housing with light and wiring costs $8.00 and a smoke unit with mount is $10.00. The smoke unit mounts to the middle lug on the smoke switch and the other wire to the on side of the switch. The lamp wires go to the middle lugs on both sides of the other switch.