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Approved cleaners (quick table)
| Surface / part | Safe choices | Notes |
|---|---|---|
| 304/316L stainless chamber | IPA (70–99%), EtOH, mild neutral detergent | Wipe dry; avoid chlorides on 304. |
| Painted/coated aluminum | IPA ≤70%, mild detergent | Avoid strong ketones/aromatics. |
| Acrylic (PMMA) window | IPA ≤70%, acrylic-safe cleaner, water + mild detergent | No ammonia, no acetone/MEK, no abrasive pads. |
| Polycarbonate (PC) window | PC-safe cleaner, IPA ≤50% | Hard-coat helps; still avoid strong solvents. |
| Laminated glass | IPA/EtOH, glass cleaner (ammonia-free preferred) | Use microfiber; no powders. |
| Glove ports / O-rings (Viton/EPDM) | IPA/EtOH, OEM-approved silicone-free lube | Wipe residue; don’t flood grooves. |
Rule: when in doubt, test on a hidden corner first.
Red list (don’t use inside the box)
- Acetone, MEK, toluene, xylene on acrylic/PC/painted Al — crazing, haze, peeling.
- Ammonia on acrylic — stress cracking.
- Abrasives (powder cleansers, green pads) — scratches that trap residue.
- Silicone sprays near bonding/painting processes — contamination headaches for months.
15-minute cleaning routine (per shift)
- Cover solvents → lids on bottles and waste cans.
- Dry wipe → microfiber pass over work zone; collect debris.
- Targeted clean → dampen wipe (don’t soak); IPA/EtOH on steel, window-safe cleaner on windows.
- Ports & seals → inspect door O-rings and glove beads; remove lint; tiny film of OEM lube if spec’d.
- Sensor intake → keep 10–15 cm zone free of wipes/beakers.
- Log → note cleaner used and any damage (scratch, chip, swollen seal).
Monthly deep clean (60–90 minutes)
- Windows: use plastic-safe cleaner (acrylic/PC) or glass cleaner (glass). Finish with anti-static wipe to cut dust attraction.
- Shelves & rails: remove, clean both sides; check for paint chips.
- Gloves & rings: uninstall if needed; wash outer surface with mild detergent → rinse → dry fully.
- Antechamber doors: clean seats and O-ring grooves; replace nicked O-rings.
- Post-clean purge: brief circulation with lids closed; confirm dew point/O₂ return to baseline.
Stains, haze, and scratches (what actually works)
- Fingerprints/haze on acrylic/PC: plastic-safe polish; light pressure; microfiber only.
- Fine scratches on acrylic: plastic scratch-remover kit (multi-stage polish).
- Deep scratches or solvent whitening: stop—replace the panel; polishing can distort optics and weaken the sheet.
- Steel tea-stains (304): passivation wipe or approved stainless cleaner; rinse and dry.
Cross-contamination control
- Dedicate color-coded wipes per area (window vs bench vs ports).
- Keep silicone-containing products out unless your process requires them.
- Store cleaners in small squeeze bottles with check valves; no spray fog in the box.
- If dew point rises after cleaning, you used too much liquid—reduce volume.
