while I'm on a posting roll...

I've used pickling paste on 316L for the last few of my sculptures,
but I've had a disturbing thing happening... While it brightens the
stainless (almost a blue tint) and removes all the little surface rust
spots, it also leaves a coating... almost of a 'smudged' look..

I leave the past on for about 15 to 20 minutes and agitate it with a
nylon brush before rinsing and rubbing (with my rubber gloves on) it
off.

What Am I doing wrong?

Thanks,

James, Seattle (port orchard, Washington, USA, Earth