Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean grout haze [title] Wait a day for the grout to set. [step] Grout haze often appears soon after the grout and tiles have been installed. If you are cleaning grout haze off of tiles that have recently been installed, wait a day for the grout to set.

Ending1: [title] Screw or snap the grout onto the tiles with a roller drive. [step] Hold the roller drive vertically with your palm facing down to ensure you do not sever the grout. Ending2: A half an hour should be enough time. [title] Scrub grout haze with a scouring pad or grout cleaner. Ending3: [title] Block the grout haze with a decal. [step] Once the haze has set, a decal will appear on the surface. Ending4: This will allow the grout to firm up so it is not damaged when you are removing the grout haze. This is key if you have smooth tiles made of glazed ceramic or porcelain.

Answer format: ending1/ending2/ending3/ending4