White phosphorous smoke works well, too, as the missile flies through the smoke WP particles have a good chance of burning through the control wires, and anything that obscures the operators view of his missile is an improvement.
It's not just the NVA who used the Sagger, aka the 9M14M Malyutka, however.... and they make a very nice job of a BRDM armored car, as you might expect.
Of course any real man would run up and toss a mine with a burning fuse on the back of the tank to destroy it as in, “Men Against Tanks”.