Startron is 99.5% or so Naphtha.

I haven't ever been given a proper explanation for what "enzymes" they claim to have in there.

I even spent about $40 to have some shipped to me from a shipyard in Maine before I realized I'd been had.

There are biocides however.

I used one made by Power Service.

I don't know how much of a difference it made but if there was anything living in there it surely perished.

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1993 W124 300D
-297K on the clock as I type this.