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Old 03-30-2009, 09:25 AM   #1
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Default cleaning mildew sikens

i did a cedar cabin about 5 years ago with sikens log stain, in the cedar color. where the 5 feet of snow on the deck sat against the walls, theres some bad black mold/mildew/weatheriing going on. can this be maintenance by spraying down with wood cleaner an pressure washed? im afraid of damaging the film of the sikens or or discoloring it. any help?
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Old 03-30-2009, 09:55 AM   #2
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http://www.spore-tech.com/viewCatego...?idCategory=78

Interesting link explaining that sodium hypochlorite, common household bleach, is not a good mold and mildew killer on porous surfaces. Many of the exterior mold remediation cleaners for wood are hydroxide based and kill mildew through high alkalinity and "shock" the spores and kill the roots. Usually, these types of cleaners are less noble to paint and stain films and will not effect the finish. If the finish is severely weathered or degraded, some of the finish may be effected. Good idea to obviously test an area first to see its effect in cleaning and if it compromises the finish.
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Old 03-30-2009, 09:57 AM   #3
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Originally Posted by Quaid? View Post
i did a cedar cabin about 5 years ago with sikens log stain, in the cedar color. where the 5 feet of snow on the deck sat against the walls, theres some bad black mold/mildew/weatheriing going on. can this be maintenance by spraying down with wood cleaner an pressure washed? im afraid of damaging the film of the sikens or or discoloring it. any help?
5 years is to long. Sell maintenance every 2-3 yrs. You may need to strip it if the mildew has gotten behind the film. Strip, brighten, finish, sell.
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Old 03-30-2009, 10:11 AM   #4
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5 years is to long. Sell maintenance every 2-3 yrs. You may need to strip it if the mildew has gotten behind the film. Strip, brighten, finish, sell.

That's was my thought as well, after 2 or 3 yrs you shouldn't be responsible for it and sell them on re-coating this year and then get them on a regular maintenance program. If they invested in that type of siding they should understand. good luck.
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Old 03-30-2009, 10:14 AM   #5
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Originally Posted by NACE View Post
http://www.spore-tech.com/viewCatego...?idCategory=78

Interesting link explaining that sodium hypochlorite, common household bleach, is not a good mold and mildew killer on porous surfaces. Many of the exterior mold remediation cleaners for wood are hydroxide based and kill mildew through high alkalinity and "shock" the spores and kill the roots. Usually, these types of cleaners are less noble to paint and stain films and will not effect the finish. If the finish is severely weathered or degraded, some of the finish may be effected. Good idea to obviously test an area first to see its effect in cleaning and if it compromises the finish.
I have been hearing this more and more,

Nace - What are good alternatives to bleach for exterior cleaning that can effectively kill mildew? I have experimented with a few things and still think bleach is the best option.. We could start a new thread on this as not to hijack Quaid's thread..
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Old 03-30-2009, 06:33 PM   #6
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ive always used cabots problem solver mildew wood cleaner and it works great
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Old 03-30-2009, 06:44 PM   #7
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Good point to starting a new thread. Not sure what the answer is since bleach apparently does not kill mildew, but puts it into a dormant state for up to six months. We make cleaners, as do many others, that contain wetting agents, surfactants and high alkalinity that allow the sodium hypochlorite to "wet into" porous surfaces such as wood. This is supposed to effectly kill mildew and its roots if used properly. Is painted wood a "non-porous surface?" Not sure according to the link I suggested. However, indefference to some proprietary cleaners, brighteners, removers and wood restorers, here is a link to JOMAX, a Zinsser product, that claims to "kill" mildew.

Cleaning mold and mildew removal with Jomax.
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Old 03-30-2009, 07:44 PM   #8
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we have used Jomax in with the bleach and it is our current solution for mildew
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Old 03-30-2009, 07:55 PM   #9
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I have always used bleach tsp and simple green mixture.
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Old 03-30-2009, 09:22 PM   #10
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I have good results using hydrogen peroxide, I have seen a lot of the mold and mildew remediation co.'s using this, also floods dekswood(sodium hydroxide base works well also.
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