Check that the mug is sound
Inspect the rim, handle and interior for chips or cracks. Decorative transfers, metallic trim and handmade glazes may limit dishwasher use or the products that can be applied. Read the maker's care guidance if available. A stained but intact everyday glazed mug is different from a damaged or porous vessel. Do not try to make a cracked mug suitable for hot drinks by cleaning the line more thoroughly.
Start with normal washing
Use warm water, suitable washing-up liquid and a soft sponge where the care instructions allow them. Give residue time to soften within the permitted method rather than attacking it with a metal scourer. Rinse and check the surface in good light. If the stain remains, use only a treatment the mug maker or an appropriate product label supports for that glaze and food-contact use. A recipe circulating online is not evidence of compatibility.
Rinse well and review the result
Remove all cleaning residue according to the product instructions and let the mug dry. Stop if the glaze becomes dull or decoration transfers to the sponge. Keep an ordinary washing routine after tea rather than leaving a small amount to dry repeatedly inside the mug. Store cups so their rims do not knock against hard edges. If staining is accompanied by roughness, crazing or a damaged interior, ask the maker about continued use rather than escalating to progressively harsher cleaning.
Before you call it done
- Inspect the glaze, rim and handle first.
- Begin with a soft sponge and permitted washing.
- Use only food-contact-appropriate compatible treatments.
Know the limit. Never mix cleaning chemicals in a drinking vessel. Retire or seek advice about a cracked, chipped or uncertain food-contact surface instead of trying to clean away damage.
