Sweep the floor to remove dust and dirt.
Damp mop the VCT tile using your regular VCT floor cleaner. Allow the floor to dry thoroughly before continuing.
Scrub the floor using a VCT stripping solution. Dilute the stripper according to the package directions. Use a floor buffer with one scrubbing disc. You can rent these machines from your local home improvement supply store.
Remove the cleaning solution with a dry mop or a wet/dry vacuum cleaner. Rinse the floor with clean water, and allow it to air-dry.
Apply a VCT floor sealer to the floor. Follow the manufacturer's instructions, as each brand can vary slightly in application directions.
Apply at least three coats of VCT floor polish according to the manufacturer's instructions.