The black coloring or darkening of the cedar siding is caused by mold growth.
Cleaning log siding before staining.
After that another coat of stain or clear coat should be applied to replenish uv absorbers blockers resin and pigment.
Dealing with surface contaminants once the surface is in good condition re inspect for dirt mildew stains cedar bleed chalkiness and other foreign substances.
Point your pivotpro hit the trigger and start spraying cleansing water against your dirty wood siding.
Typically you should apply the cleaner by spraying it on and using a sponge to work the cleaner into the wood.
Step 2 power wash the cleaner off the siding.
If the color is ok the clear should be applied in order not to overly darken the appearance.
Clean means well clean.
So the best approach is to wet down the wall with water mist from your garden hose apply the log wash solution and work an area that is limited so the wash remains on the wall for no more than 10 minutes.
Do not wash the wood with bleach tsp or any cleaning solution containing bleach or oxalic acid.
It means free of dust pollen bird poo pencil marks mill glaze this is a biggie or anything else that makes your logs dirty.
How to clean stained cedar siding.
Bleach is very hard on wood and causes fuzz.
Step 1 applying cleaner to your siding use a bleach or wood cleaner to apply to your log siding before applying stain.
At 46 inches in.
Spray the wood cleaner onto the siding with warm water if possible for better absorption.
Let the cleaner sit on the siding for a time according to the manufacturer s instructions.
Mold mildew or algae growth under the stain.
Contaminants that get trapped under the stain can lead to.
Oxalic acid causes problems with timber pro uv and other finishes by making them turn gummy.
Sashco s cpr is perfect for this job.
Peeling or flaking stain.
Stained cedar siding has a tendency to discolor over time.
Before staining replace rotting or decayed wood and remove loose stain and eroded wood fibers by sanding scraping or power washing the problem surfaces.
Many log washes must remain wet to work effectively.
Wash the logs or siding with clean brite before re applying your clear uv coat.
Oil stains that are.