Walnut shells?

[John Hofstetter <hofs@domain.elided>]

>From: "Tom Harais" <tjhemh@domain.elided>
>Subject: Re: Walnut Treatment [WAS: ATF Treatment]
>
>Actually John:
>
>The "walnut shell" treatment is prescribed for any internal combustion
>engine. Local gas stations used to offer this service. It was supposed to
>clean up the cylinders, valves and heads. Now, with the commonality of fuel
>injection, there is some sort of injector/cylinder cleaner they are using.
>
>Tom H.

Tom,
Are you sure that wasn't Bon Ami instead of walnut shells?
John H.