The internal damage may be irreparable for those who survive lye poisoning.
Even a drop spilled on your skin or a dry crystal that falls on wet skin can cause damage. A good washing with TSP makes your deck look great. Is TSP cleaner safe TSP is moderately toxic by ingestion and is a minor skin irritant, but the big advantage of using it is that it doesn’t produce toxic fumes. You can clean your deck with TSP in one day. The chemical is strong enough to remove dirt and grease from the surface of your deck, but will not harm your plants or lawn when you rinse the deck. Standard TSP must be rinsed away with clean water. Trisodium phosphate, or TSP, is a common deck cleaner.
For those interested in its chemistry, TSP is made by neutralizing phosphoric acid with sodium hydroxide and its chemical formula is NA 3 PO 4. Apply the TSP Trisodium Phosphate cleaning solution with a pressure washer or garden sprayer. It is a commonly used cleaner and stain remover.