Thicken the solution a little by boiling off some water or adding a thickening agent like cabosil (
http://www.caswellplating.com/goldpl8.htm) then paint it on with a brush.
Spray it off with a hose, but make sure to capture the runoff. You'll have to rig a plastic bathtub or something similar.
Kind of wasteful, but if you can't dip it's the only way.