Clear corners are available for both 1G and 2G DSMs. Or, at least, they are at the time of this writing.
According to Brad McIntyre, stock 90-91 DSM corner lenses are two part assemblies that can be converted to clear corners. All that is required is to soak the lenses in boiling water to soften up the glue. The lens halves can then be separated, and the amber lens removed. He also suggests painting the lamp housing chrome, and cleaning the lenses really well before putting it all back together.
Unfortunately, this mod does not work for 92-94 DSMs, or 2Gs. You can often find the clear corners you want on eBay, though.
Those installing clear corners will want to polish their headlights. The headlights will not appear faded or yellowed, until you put the brand-new clear corners next to them. To fix up this problem, wet-sand the headlights with 1000-2000 grit sandpaper, available at any Canadian Tire or other store that carries basic autobody repair materials.
The Last Word: With aftermarket replacement headlights now available at low cost on eBay, polishing the headlights is probably more trouble than it's worth. Just replace them.