Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to install ceiling tiles [title] Clean the ceiling. [step] If the ceiling isn't very dirty, simply use a broom covered with a tee-shirt to dust away any dirt. If your ceiling is dirty or greasy, use a sponge to scrub one small section at a time using an all-purpose cleaner.

Ending1: [substeps] For less clay, put the tile below the first section to clean it into texture. [title] Precondition the ceiling tiles by applying primer. Ending2: Rinse and dry the sponge after each use. [substeps] If the tiles are painted black and they have urine stains, allow them to dry overnight. Ending3: It's important to let the ceiling dry thoroughly before applying your tiles. [substeps] A clean surface will make your tiles stick more effectively. Ending4: Depending on the humidity or dampness in your house, your tiles may need to be cleaned more than once. [substeps] Paper towels are a great option as they will leave behind all sorts of lint, and you can wipe down your tiles directly with a vinegar solution on a regular basis.

Answer format: ending1/ending2/ending3/ending4