stain remover

White Knight Fiberglass Stain Remover


This non-abrasive stain remover eliminates tough stains on fiberglass gelcoat, and painted surfaces. Ideal for removing waterline stains caused by rust, scum, and exhaust without hard scrubbing.

In stock

SKU: 490472 Category:


  • Stain remover for use on fiberglass, gelcoat, and painted surfaces
  • Works quickly to remove stubborn stains and discoloration
  • Easy to use—leave it on the stained surface and it does the work for you, without hard scrubbing or harsh fumes
  • Safer for gelcoat and other paint surfaces because it’s non-abrasive
  • 100% biodegradable formula is safer for the environment
  • Perfect for removing stains at the waterline and from non-skid decks and even fiberglass bathtubs
  • Size: 16 fl. oz.

Removes stains and eyesores from fiberglass without making arms sore

Wet the stained area with water before you start then simply brush a thin layer of White Knight directly on the stain and leave it there for 10-15 minutes to give it time to work. Follow up by scrubbing very lightly with a sponge or soft brush, then rinse thoroughly with water to remove White Knight so it doesn’t dry. Your arms will feel nice and rested, and you can now use all that elbow grease you didn’t have to use for stain removal to polish and protect.


  • Color: Light blue; washes away completely when the product is removed
  • Number of applications: One application removes most stains; tough stains may need a second application
  • Application methods: Chip brush or rag; scrub lightly with a soft brush or sponge
  • Application temperature: 40-100°F
  • Personal protection: Wear rubber gloves and eye protection; avoid contact with skin
  • Cleanup: Water
  • Safe for use on all colors of paint and gelcoat, but it’s recommended that you test any painted surfaces in a small, inconspicuous spot before full application
  • After removing stains with White Knight and rinsing thoroughly with water, protect the surface by applying TotalBoat Premium Boat Wax or TotalBoat Podium Finish marine polish with PTFE.

TotalBoat products frequently used with White Knight

  • TotalBuff
  • TotalShine
  • Boat Soap
  • Fiberglass Polish
  • Premium Boat Wax
  • Podium Finish

TotalBoat White Knight Technical Data

White Knight Fiberglass Stain Remover SDS

White Knight Fiberglass Stain Remover California Cleaning Product Disclosure

Frequently‌ ‌Asked‌ ‌Questions‌ ‌

Can you use White Knight Fiberglass Stain Remover to clean a fiberglass shower?

Yes, it can be used to clean fiberglass showers and bathtubs. We recommend following up with a surface protectant like 303 Aerospace to repel stains.

Will fiberglass stain removers restore yellowed plastic to their original white color?

No. If age has turned the color to an insipid yellow, you won’t be able to restore the color with a cleaner. White Knight will only remove dirt and grime.

Will White Knight remove yellowing from UV wear in fiberglass gelcoat?

No, it will not remove yellowing from UV wear in fiberglass gelcoat.

Will fiberglass stain remover remove green and yellow stains at the waterline?

Yes, it will remove green and yellow stains at the waterline.

Can you safely use this fiberglass cleaner on non-skid surfaces?

Yes, White Knight’s non-abrasive quality makes it a great cleaner that can be used safely on non-skid surfaces.

Will it remove gelcoat stains caused by growth?

Yes, but it’s recommended that you test any painted surfaces in a small spot before full application to ensure it will not damage the finish.

Will fiberglass stain remover remove rust stains?

Yes. White Knight is great for removing rust, scum, and other stains without damaging gelcoat.

Do I need to wear personal protective equipment when using this stain remover?

Yes. It’s important to wear protective gear like long rubber gloves as most cleaners of this kind contain a mild acid that can cause burns.

Can White Knight be used to clean or remove stains from wood?

No. This is a Fiberglass stain remover, so it should not be used on wood.

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