On Tue, 04 Aug 2009 17:51:40 -0400, Keith Nuttle
wrote:

I heard today the they were putting Sodium silicate into the engines of
the "clunkers". It seems that the silica could be removed after getting
credit by using Hydroflouric acid, which dissolves silica assuming no
parts were bent or broken

You do understand that sodium silicate is highly soluble in plain
water?

Casady