Someone mentioned that Formula 409 was good for cleaning grime off a IIgs case. Is that not chemically harsh on the plastics? Will it alter the plastic in some way, using this cleaner?? IF not--need I dilute it or something rather than just spraying on a cloth and wiping down the GS? Don't want to "melt" the case any. Thanks. bp -- "Heisenberg may have slept here."