[The Body God]

The best solution is to take the intake off, if it's cleared, get that stripped off chemically. A blast cabinet using "Glass Bead" only NOT sand, and blast it. I have had a blast cab for many years, I always use Glass Bead because it cleans without pitting, which is what typical silica sand does. Glass bead is quite pricey, $5.00 bag of silica sand = $50.00 of Glass Bead, but it will give you that like new appearance.