The lye, hydrochloric acid and sulfuric acids found in drain cleaners can burn human tissue, causing permanent damage. If not used precisely according to instructions, some products can explode. These products are particularly dangerous around children. For persistent clogs, use a metal drain snake. Avoid contact with skin and work in well-ventilated areas.
Most wood polishes contain phenol, which causes cancer in lab animals.
Residual vapors contaminate your home long after application. Wood polish can also cause severe skin irritation. Use a mild vegetable oil soap on varnished wood. Scrub scuff marks with toothpaste. For wood floors, use a mixture of mild vegetable oil soap and water and dry immediately.