Kohler Customer Service 

Vitreous China Bathroom Sinks

• Rinse thoroughly and use a soft cloth to wipe the product dry after each use.
• Soft abrasive cleaners may be used when necessary to clean KOHLER vitreous china products. Strong abrasive cleaners will scratch and dull the surface.
• Do not store open containers of cleaners or chemicals such as acids, bleach, sodium chloride, lye, toilet bowl cleaner, drain cleaner, or hard water stain removal products under your sink.

Cleaning instructions listed pertain only to their corresponding material and are not intended for faucet cleaning. Faucet cleaning instructions for chrome and vitreous china.
Success with cleaners and procedures is dependent upon such factors as the hardness and temperature of the water, using exact measurements of ingredients, changes in cleaning formulas, and the condition of the product being cleaned. Since there are variations within these factors, Kohler cannot guarantee the effectiveness of the formulas mentioned.
  
products to Consider 

• Clorox Disinfecting Bathroom Cleaner
• Comet Bathroom Cleaner
• Fantastik Antibacterial Heavy Duty
• Formula 409 Antibacterial All Purpose
• Green Works All-Purpose
• Lysol Bathroom Cleaner
• Soft Scrub Gel with Bleach
• Soft Scrub Lemon Cleanser
• Tilex Bathroom Cleaner

For rust removal:

• Bar Keepers Friend
• Super Iron Out Rust Stain Remover