For those on a budget…. some wet sanding paper in the 400-800-2000+ grit works wonders as well followed up with toothpaste. For equivalent cost to the kits, and to make the look last however, you really should have them painted with a plastic prep adhesive then a proper clearcoat at a body shop. If you have everything masked off and ready, a body shop should do this for minimal cost.
This will be very durable and UV protecting for years afterwards so you don’t have to keep rebuffing. Give them a good wax after and you are better than new:)
theSAABguy 
For those on a budget…. some wet sanding paper in the 400-800-2000+ grit works wonders as well followed up with toothpaste. For equivalent cost to the kits, and to make the look last however, you really should have them painted with a plastic prep adhesive then a proper clearcoat at a body shop. If you have everything masked off and ready, a body shop should do this for minimal cost.
This will be very durable and UV protecting for years afterwards so you don’t have to keep rebuffing. Give them a good wax after and you are better than new:)