Use a razor blade ONLY when there is surface-level buildup, such as:
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Soap scum
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Hard water marks
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Mineral deposits
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Paint overspray
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Grime stuck on top of glass or smooth surfaces
The blade is used to lift buildup, not to treat stains.
If it’s absorbed into the surface (like grout stains, etched glass, or discolored stone), the blade won’t help — in those cases, use SHYN Paste or SHYN Degreaser to break it down.