Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean mildew from grout [title] Try water alone for mild mildew. [step] If you clean regularly, mildew is probably mild. A small film of mildew covering grout does not require special cleaners.

Ending1: However, harsh cleanings may also damage grout's bonding. [title] Wet the grout properly with warm, wet water. Ending2: However, if the stain or mildew is severe enough to sit untouched, it might be worth an effort to clean it with water alone. [substeps] Use a mixture of water and white vinegar to clean grout stains. Ending3: Furthermore, you do not want to pick up an unwanted oil or any other allergen in the process. You can use regular background washing, but the important thing is to use the right kind of cleanser. Ending4: For this mildew, stick to simply scrubbing water between the tiles. This should be enough to get rid of unwanted mildew.

Answer format: ending1/ending2/ending3/ending4