Will this molding work with an aftermarket front bumper?

This clips to factory mounting points on the OEM bumper. If your aftermarket bumper uses the same lower edge attachment system, test-fit it first—mounting compatibility varies by bumper design.

What's the best way to clean the chrome before installation?

Wipe down with mild soap and water, then dry completely. Avoid abrasive cleaners or steel wool, which can scratch the finish. A microfiber cloth works best.

Do I need to remove my bumper to install this?

No—this molding clips to the lower edge of the bumper from the outside. You can install it without bumper removal, though you may need to access underneath slightly depending on panel gaps.