Uncoated, weathered
cedar siding or trim can often be restored
to its original color by applying commercial
products called cleaners, brighteners or
restorers. Although intended primarily for
restoring horizontal wood surfaces such as
decks, they generally work almost as well
on vertical surfaces. Some products are formulated
with thickening agents to help the liquid
cling better to vertical surfaces. The manufacturer's
instructions should be followed for optimum
effectiveness.
Commercially available deck cleaners and
restorers generally fall into three categories:
paint strippers, bleaches, and oxalic acid-based
formulas. These products contain hazardous
ingredients and should be used with caution.
Paint Strippers
Paint strippers will also remove oil-based
stains and latex stains. Most are supplied
as ready-to-use liquids. After use, residual
strippers should be thoroughly rinsed from
the wood surface before any other coating
is applied.
Bleaches
Bleaches are effective in counteracting
mildew but do little to remove dirt or other
surface deposits. Aggressive scrubbing with
caustic cleaners such as bleach will remove
surface wood fibers and result in the wood
having a rough, unnatural whitish tone.
Oxalic Acid-Based
Products
Oxalic acid-based products remove extractives
bleed and iron stains but are not effective
against mildew. After application of these
products the deck should be thoroughly washed
with clean water and allowed to dry completely
before finishing.
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