Just clean it real good.
It you want, after first clean, you could use a plastic brush and scrub it so the nooks and crannys are clean with Laquer thinner.
When you paint it, light sprays after tacking up 2-3 times. Then put on cookie sheet in oven at 170 degrees to cure for about 10 minutes. Paint glosses up better with heat a little bit after you painted it.
