White marks on tiles - getting rid

[MrsRonnie]

Morning all!

I have some wall tiles that have been sitting in the corner of the shed for 13 years or so. They're a matt finish and they have a white grid pattern on them which has transferred from the bottom of the tile on top of it. I'm not sure what the substance is on the back of a tile. I've tried spit, babywipes and washing up liquid so far, with no success.

The tiles are similar to this http://www.toppstiles.co.uk/tprod989/za ... -tile.html

Any ideas of what the substance is, and how to get rid of it?

TIA

Ronnie

[Maroochydore]

It's obviously the ceramic material from the tile that has been in contact. Try using vinegar and rubbing hard.

[DrFfybes]

As they're Matt finish, also try a stiff cloth, or even a non-stick (white) washing up sponge, and some baking soda or toothpaste as a mild abrasive.

Paul

[pochisoldi]

A plastic pan scourer will probably be abrasive enough to remove a deposit without scratching or marking the tiles.

e.g. http://www.wilko.com/cloths+rubber-glov ... vt/0269791