How to remove marks from mugs?

I’d gently use Comet.

Sometimes when my mugs have hard-to-get-rid-of stains scrubbing them with a bit of baking soda does the trick for me. I’m not sure if that will make them drinkable again though. In fact I’m not really sure how poisonous pen/pencil residue is.

@jbfletcherfan That sounds like it could work but you’d better rinse really well afterward ;).

Try that Mr. Clean Magic Eraser or one of its clones. It has worked for me.

1 Wash with soap and water.
2. Saturate a paper towel with Isopropyl Alcohol and use to wipe inside. This removes the ink.
3. Wash with a paste made from Bon Ami and water.

Rinse thoroughly

@gggritso Oh, of course. Comet isn’t hard to wash out.

Fill the sink with bleach and cold water, leave to soak and then wash as normal. Works with discoloured cutlery too!!

Bicarbonate of soda or Borax , add enough water to make a paste then rub and rinse .