Borosilicate Glass Care: Dishwasher, Microwave & The 5-Minute Cleaning Routine

Double-wall borosilicate cups are tougher than they look — but a few small habits will keep them looking new for years instead of months.

Dishwasher: yes, top rack

All Kazomo double-wall glasses are top-rack dishwasher-safe on a normal cycle. The top rack is gentler, hotter water sits at the bottom, and there is more space between glasses so they do not knock together during the wash.

Hand-washing: 60 seconds with warm water and mild soap

For occasional hand-washing, use warm — not hot — water and a soft sponge. Avoid abrasive scourers; they will dull the crystal-clear finish over time.

Microwave: yes, with one rule

Borosilicate handles the microwave well. The only rule is to avoid extreme thermal shock — do not microwave a glass straight from the freezer.

Storage

Store upright with space between cups; never stack rim-on-rim. If you stack, place a soft cloth or paper between each cup.