That stuff sounds scary. Here's the directions from:
http://www.hydro-zoneinc.com/ftp@hy... aluminum stainless steel clnr (05-04-04).pdf
USE EXTREME CAUTION! NOT TO BE USED BY
AMATEURS. Protective clothing (including, but not necessarily
limited to: apron, goggles, respirators, mask, face shield, gauntlet
gloves, boots) is required when using this product.
DO NOT USE ON THE FOLLOWING SURFACES:
Bright aluminum or bright stainless steel, chrome, zinc, galvanized
metal, tin, or magnesium. May produce etch to glass. To prevent, keep
glass wet or cover the glass with a light coat of grease.
Dilute with water as follows:
Spray equipment: 1:50. Increase 1:40 in winter. Best results
obtainable using hot water (140°F.)
Manual equipment: Use natural bristle brush. Do small area at a
time. Thoroughly rinse off acid with clean water.
Apply by brushing or wet spraying BOTTOM TO TOP in panels or
sections. DO NOT inhale or work in spray. DO NOT allow to dry on
surface. Rinse the surface before it dries. Rinse any area that has been
hit by overspray or mist. Overlay the edge of the old panel cleaned as
you clean the new panel.