If and only when isopropyl alcohol fails, try a clean with 100% acetone. Acetone rejuvenates the PEI surface by removing oxidation, but can eventually contribute to cracking of the PEI. Consider a wipe every month or so for conditioning. Here again, apply a small puddle in the center of the PEI and use a clean paper towel to wipe away from the print area.
Clean Master 7.2.4 Crack
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