Wet timber with fresh cold water.
Apply the made up solution to the timber and scrub using a stiff brush. Wear gloves at all times.
Leave 30-40 minutes and then rinse off with fresh cold water
If necessary, repeat process
Allow to dry for 24-48 hours (no rain) before applying a good quality timber finish
Note:
If your timber has been grey and weathered for many years, this process may not be effective. The only option may be sanding or replacement.
The tannins in some timbers have a chemical reaction with sodium percarbonate. In particular, use of sodium percarbonate on garapa will turn the timber green. Always test suitability before cleaning.
