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Originally Posted by 814jeffw
Not if used at proper dilution rates. If you're not familiar with butyl based just be very cautious. Start with a mix of 1 qt. of something like Castrol Super Clean or Purple Power to 3 qts. water, that shouldn't hurt anything and by looking at the pictures I'd say you're not gonna hurt anything at an even stronger percentage. Test spots. I use oxalic mixed at 1 cup per 5 gallons of water, that won't hurt that siding, but still do a test spot. Butyl based is often used for removing oxidation, just learn to use it.
Jeff
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Jeff,
I enlarged Pat's pictures and it looks like the red stains are actually something that is running down from underneath the laps in the siding. That leads me to think Richard has a good point...the stains may be coming from the house wash solution getting under the siding and dissolving the ink writing on the weather wrap. I can see how this could happen. I saw a new house under construction the other day where they were putting up the weather wrap. The wrap had the local lumber yard's name printed all over it in bold red letters like some kind of big billboard.
So if this is ink on the hardie board I was wondering if Melamine might work on it? Since you put me onto Melamine I am a believer in it now and keep a supply in my truck at all times.