Cold machine wash, gentle cycle, line dry in shade. No fabric softener. It softens for about twenty washes then settles.
Dishwasher safe. Handwashing keeps the glaze brighter. Avoid moving it straight from fridge to oven.
Hand wash and dry standing. Re-oil every few months with a food-safe oil. Never leave it soaking.
Air rather than wash where you can. Wool cycle or cold hand wash, dry flat, out of direct sun.
Trim the wick to 5mm before each burn and let the first burn reach the edge, or it will tunnel.