what is a fern bar? a place to drink fern juice???

>
>I am certain a solution of TSP (trisodium phosphate) will work and that is
>what I would try first.  When I owned a fern bar, TSP was recommended to
>clean the cathode plates of the electostatic precipatators, aka smoke
>eaters.
>  After a good Saturday night, we are talking about cigarette stains which
>could be used for floorcovering.  It would also clean that tenacious stuff
>off plastered wall painted with oil based enamel paint.  That required a
>dilut solution and some care

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