1. How to deal with black tile adhesive?
Dissolve alkali in warm water and use a damp cloth to wipe away stains in the grout lines. The stains can be easily removed. Alternatively, spray a cleaning agent onto the black grout lines, and after 10-15 minutes, scrub with a toothbrush. Then, reapply a waterproof sealant to effectively prevent mold and mildew growth in the grout lines.

Two. How to remove black tile adhesive
1、 You can apply and evenly spread a common cleaning oil, then use a fingernail to remove the adhesive in the areas that can be scraped off. Wipe away the remaining residue with a damp cloth. Next, use a hair dryer to heat the adhesive, which will then be easily removed. If there are any cracks after removal, you can apply a small amount of rubbing alcohol to the adhesive residue, and after a while, the residue will easily wipe away.
2. This method involves using alcohol and a rubber eraser, which can be effective but requires effort. If there are any adhesive residues after cleaning, a cloth dampened with vinegar can be used to cover the entire area. once the adhesive residue is completely saturated, it can be easily removed with a ruler. Alternatively, the area can be soaked in water and then cleaned with a small amount of dish soap and an old toothbrush.
3. Alternatively, use a cloth dampened with baijiu or sorghum wine to wipe the surface. If adhesive residue remains after wiping, you can remove it with a solution of soap, a small amount of nitrogen-rich water, and a mixture of rosin.
III. How to Prevent Tile Adhesive from Blackening
1. Surface Preparation: Grouting should be performed 24 hours after the tiling is complete. Before using the grout, the tile surfaces must be thoroughly cleaned, removing dust, oil, debris, and any excess tile adhesive from the grout lines.
2. Mixing: Use an electric mixer to thoroughly mix the tile adhesive. According to the ratio of powder and water, strictly mix the tile adhesive to create a paste-like consistency. After allowing it to sit for 15 minutes, mix it again for optimal results.
3. Application: Use a trowel to apply the jointing agent into the gaps between the tiles. Apply the jointing agent in a diagonal or circular pattern, ensuring that as much excess jointing agent as possible is removed from the tile surfaces. Before the jointing agent has fully cured, clean the tile surfaces with a damp sponge or cloth.