If it is unglazed on that part then it is still very porus and the marker has gone into the pores.
Cleaning marker off unglazed ceramic.
Glazed ceramic tile is less susceptible to staining than unglazed tile due to a lower porosity but also require a deeper cleaning periodically to remove contaminates that are left behind from general housekeeping processes.
Cleaning stained or dirty pottery and china.
Proactively prevent tile staining.
If the tiles darken they re most likely unglazed.
However due to the rougher finish these decorative items tend to attract and hold dirt more firmly than their glazed counterparts.
Unglazed porcelain tile cleaning techniques.
If a wood cleaner is not available you can easily make an all natural one with items from your kitchen.
You can clean this off by polishing it using a wood cleaner.
Pour 1 4 cup of the olive oil.
Staining is a common but avoidable issue for unglazed ceramic tile surfaces.
Unglazed ceramic tile and grout have a matte finish that s extremely popular.
Use a cotton ball to apply it to the stain and scrub it off with circular motions.
Therefore the only way i know to get it off is to sand it off until you don t see the marks anymore and hope that that doesn t also make you have to sand it way into the thickness.
Then wipe off the excess oil with a damp cloth.
Unglazed porcelain tiles will all look basically the same with monotonous designs and no shade variations among the tiles if you re not sure cantini suggests letting water sit on the tiles for five minutes and then wiping it off.
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Repeat as needed until the marker is gone.
There s no need to dunk your roseville vase in peroxide if a simple soap and water solution will do the trick.