I wouldent call them dirty but. there prety damaging as far as kicks and punches.
The first is the toe kick as, usualy, all street sutuations you have your shoes on. first you exicute a regular round house according to your MA exept have the point of the toe part of your shoe, stabbing them, making hard pointy area of contact. aim for the ribs and below. very painfull.
It seems that this is slower than the standard round house.
The other thing is more like a cheep shot because it takes both your hands, slow, range sucks and leaves you open with the exeption of having alot of weight and inertia behind it.
Take your dominate hand and cup it around the fist so that your fingers are on top of your Knuckles. strike downwards or sideways as like swinging a base ball bat hitting with the heel of your fist. Its most effective On the side of the head and when ther head is lower than your waist
eny other tricks...