Removing silicone residues from glass
is difficult as silicone combines with the surface molecules of the glass.
The best advice seems to use a very
sharp flat blade similar to a paint scraper. There is a tool which
holds razor blades or Stanley knife blades which is suitable. Keep
the blade as near parallel to the glass surface as possible. Take
thin slices of the silicone away at each pass. Keep the blade free
from nicks. Change the blade frequently. You may be able to remove
almost all the silicone, depending on the smoothness of the glass
surface, in this way.
However when you have removed as much
as possible by the mechanical means, you may need to use a chemical
process to get rid of the remaining silicone. Silicone dissolvers
are available from most do-it-yourself shops. Make sure you use them
in accordance with the instructions as they can be mildly toxic.
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