Summarize the following:
You can find these hooks in home improvement stores. They are often labeled as "Command Hooks" and come with a strip of adhesive. Make sure that you get a hook specifically labeled for windows. If the window hook comes in multiple sizes, get the largest one. A smaller one may not be sturdy enough to support a wreath. These hooks can typically only carry 4 pounds (1.8kg). If your wreath is heavier than that, this method would not be a good option for you. Decide which side of your window you will be hanging the wreath on, then wipe it down with a cloth dipped in rubbing alcohol. You do not need to clean the entire windowjust the part where the hook will go. This is very important, as it will remove any dirt or oils that may prevent the hook from properly adhering. Find the side of the strip that has the black-and-white liner. If you can't find it, look for something that says "window." Peel the liner off, and leave the other one in place. Be careful not to touch the adhesive. The more you touch it, the less tacky it will be. Decide where you will hang the wreath, then press the strip against the glass, adhesive-side-down. Make sure that it is oriented vertically, then rub the strip with your finger again for another 30 seconds. Most strips will have a tab on one end. Make sure that this tab is facing down. Make sure that the hook is oriented vertically. Press the hook firmly against the window for 30 seconds. Do not get impatient and hang your wreath right after securing the hook. The adhesive needs this time to bond. If you hang the wreath too soon, the hook may fall off. If the wreath is too thick for the hook, thread some ribbon through it first, then tie both ends together to make a loop. Slip the ribbon loop over the hook. Most adhesive strips on command hooks will have a little tab on the bottom. Remove the wreath first, then pull straight down on the tab. Stretch it to about 12 inches (30cm), then pull the hook off. Peel the adhesive strip off the window. If there is any gunky residue, wipe it off with some white vinegar or a goo remover (i.e.: Goo Gone). If you can't find the tab on the strip, try dripping some rubbing alcohol, acetone, or rubbing alcohol down the glass, right above the hook. This should dissolve the adhesive.
Get a an adhesive hook meant for windows. Clean your window with rubbing alcohol. Remove the liner on the back of your command hook's adhesive strip. Press the strip against the window, then rub it with your finger. Remove the second liner and place the hook against it. Wait 1 hour. Hang the wreath over the hook. Pull on the tab when you want to remove the hook.