One recipe i found said 3-4tablespoons of epsom salts per 1/2cup beer. Another just said keep adding the epsom salts until the beer can't take anymore The first recipe mentioned making swirls on glass with paper towel soaked in the solution. If my windows aren't clean now (or before hand), they probably will be after I've had to wipe on this stuff, then wipe it off a few hundred times before I get the right look...