[boman47k]

I also use Kilz oil for this as I can never be sure of getting all the residue off. I do agree about the seams though.

 

[boman47k]

brown most likely from the age and heat of the attic over the years

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Did this brown smear with you as you washed it off? I have seen some smear and get slimey like. Made me think, what the hell? Think I have an area clean then look back and it still not be white. Wash it some more and more slime like smearing. Like somethink kept oozing out of the rock. Don't really think it was nicotine, may have been. I just felt better using oil on it in an attempt to really seal whatever might have been left in.