The dishwasher is off the table for PLA bioplastic drawer modules. The combination of heat (45–75 °C sustained), moisture, and detergent is the worst-case scenario for PLA's structural integrity. A single dishwasher cycle will visibly warp or soften most Modu Drawer modules.
Why dishwashers and PLA don't mix
Three factors compound:
- Heat. Dishwasher cycles run between 45 °C (eco) and 75 °C (sanitise). PLA's heat envelope tops out around 60 °C — the eco cycle is borderline; everything else exceeds it.
- Sustained exposure. A typical dishwasher cycle is 1.5–3 hours. Even at borderline temperatures, sustained exposure causes warp.
- Moisture + heat. The combination is harsher than heat alone. Moisture penetrates the polymer surface; heat softens; the module deforms under its own weight.
What "don't dishwash" looks like in practice
- Lift modules out for deep cleaning. Modules pop out of the grid base easily. Hand-wash with mild soap, dry, return to the grid.
- Wipe daily, hand-wash occasionally. See wipe-clean care and hand-wash care.
- Treat modules like a wooden chopping board, not a stainless tray. The mental model that gets the care rules right.
Why we made this trade-off
PLA's heat sensitivity is the cost of plant-derived sourcing and print-on-demand manufacturing. ABS modules would tolerate dishwashers but require petroleum and injection moulding. Melamine would tolerate dishwashers and high heat but adds weight and limits geometry. PLA hits the design sweet spot for kitchen-drawer modules; the dishwasher trade-off is real but manageable.
If a module gets accidentally dishwashed
Lift it out of the dishwasher carefully (it'll be soft when hot). Let it cool to room temperature flat on a surface — it should regain most of its shape. If a module is visibly warped after cooling, our take-back policy covers it; see the recycling programme.