Topic: riddle of Mill-glaze-away

[plainpainter]

There is this product that Biowash sells called MillGlazeAway

http://www.environmentalhomecenter.com/inc/msds/BW_MILL_GLAZE_AWAY.pdf

And along with prepping wood to remove mill glaze, it is also used as their neutralizer product.
Now here is the riddle, according to it's msds sheet 60%-100% of this product is simply Borax.
Borax in solution buffers around 9.5 PH.  Yet how does this product is used as a neutralizer?

http://www.biowash.com/products/product.php?pid=30
http://www.biowash.com/pdf1/stain_prep395.pdf

Now if you look at the msds sheet this products' ph in solution is roughly  5.1 PH!

Now according to answers.com - borax is slightly soluable in cold water, very soluable in hot water, and not insoluable at all in an acid.

http://www.answers.com/topic/borax


So what gives with this product?  How do you get a product that is a ph of 9.5 - but better than that is very highly alkaline, so it's hard to budge borax on the ph scale with the addition of acid.  And it is insoluable in an acid.  What the heck is this product???