Here’s a recipe for Magic Wash, the all-purpose, superior figure wash made with Future Floor polish. All you have to do is mix this with a little paint in a shade deeper than the base coat, and let it flow into the crevasses of the miniature. It’s an especially effective technique when painting a large number of historical miniatures because things go so quickly.
Matt Swan has a web page describing all of the varieties of Future acrylic floor wax, and their uses in modeling. Miniature Wargamers, of course, have discovered the use of Future in making washes that easily provide shading on painted figures.