From your local hardware store pick a box or small tub of tile grout. It comes in a varity of colors.I use a small amount to rub on boots,weapons,uniforms etc.Its best applied dry.I think it makes boots look used and worn. If you get tired of it wash throughly as the grout may try to set up.
One box/tub will do hundreds of soldiers.
One box/tub will do hundreds of soldiers.

