05/27/2026
Cleaning a brittle white painted railing.
Certain types of wood don’t do well with pre treating depending on what you are using here’s a generalized breakdown. If you ever need to treat wood make sure it’s a completely even soak and a low 0.5-1.5% mixture of SH. This has worked for us for years with zero issues.
Cedar is very prone to bleaching, fuzzing, and uneven color shifts. Western red cedar especially can turn pale, blotchy, or “stringy.”
Redwood, reacts similarly to cedar; tannins can produce dark staining or uneven oxidation.
Ipe and other tropical hardwoods dense exotic woods (ipe, cumaru, tigerwood, garapa, mahogany) often get surface oxidation, patchy color loss, or premature drying from hypochlorite.
Oak, high tannin content can react unpredictably, sometimes producing gray/black discoloration.
Walnut bleach can flatten the rich dark tone and create a washed out appearance.
Pressure treated pine (older decks especially) can fuzz heavily and lose lignin if repeatedly exposed.
Douglas fir tends to fuzz and raise grain noticeably.
Spruce, fir, pine softwoods softer earlywood erodes faster, creating striping and rough texture.