I have read the posts about Spec-6 on the HDForum site. Actually, I have never heard of Spec=6 until I read about it there.
I have never pressure washed the bike....only hand wash. It was washed at the dealers when I took it in for service....and I don't know what they use to wash it. Hopefully they wouldn't pressure wash it...or get water in the tranny......but you never know.
I'm going to flush it and fill it...I guess with HD