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Do Not Mix Chemicals for a Poultice Most grown adults know that chemicals can be dangerous. Sometimes when people are creating a poultice for stain removal on natural stone or other surfaces, they consider mixing chemicals without realizing that... Read More

If you apply a silicone impregnator to the back of a tile before setting, this may cause a bonding problem. Since most setting mortars are water based they will want to repel the water. Use an epoxy-type setting material. TIP: Before setting any... Read More

The yellowing and graying of certain Italian and Greek white marbles is a common problem that I see all over the country. There are several possible causes for this condition: Maintenance technique-Take a close look at your maintenance program. Are... Read More

I will assume you are not cleaning it with acid cleaners. There is a possibility that there is some residual acid in the grout or the pores of the stone that bleeds out when you take a shower. Try rinsing the shower wall with a solution of baking... Read More

Yes, it is possible to recolor the grout, but it needs to be thoroughly cleaned before re-coloring. If possible, find out what brand and type of coloring was used, and re-apply the same brand or type. TIP Before attempting to recolor the grout make... Read More

Wax build-up on a vertical surface can be difficult to remove, since most strippers will run. Janitorial supply stores do offer spray-on baseboard wax removers that work very well; since they are applied as a foam, they will cling to vertical... Read More

This depends on several factors, including how often the shower is used and what type of sealer was originally applied. After identifying the product, refer to the manufacturer’s recommendations. If water is no longer beading on the shower... Read More

There are many on the market. But if your shower walls are marble, you will have to use caution in choosing the proper cleaner, since most soap scum removers are acidic. Do not use an acidic cleaner on marble walls! If the tile is ceramic or granite,... Read More

Several products are designed specifically for cleaning soot and carbon build-up from marble. Contact your marble supply house. Be sure the product is not an acid; apply it per the manufacturer’s directions and allow it to sit on the marble for... Read More

The green growth you see is probably algae. Algae usually grows were there is abundant moisture. My guess would be that the tile stays wet after a rainstorm, allowing the algae to grow. To clean it, prepare a solution of bleach and water; about one... Read More