Most teak cleaners are not detergents - many contain strong acids or alkalis such as oxalic acid, potassium or sodium hydroxide, or hydrogen chloride in varying strengths designed to do the tough job of cleaning worn and weathered teak. Use them with care - they may cause chemical burns on skin or eyes. They can also damage other materials in your work area, lift paint and varnish, mar fiberglass surfaces, destroy anodizing on aluminum, and etch chrome fittings. Not all are properly labeled.

When handling teak cleaners, wear rubber gloves, keep a hose handy, and always thoroughly flush the area where these chemicals are used. If skin contact is made, flush with running water. Consider wearing goggles to protect your eyes from being splashed. Avoid fumes, which may irritate eyes.