Windex is right. Water with 2-3 drops of dishsoap works....2-3 drops only.
I did one side of my black and red bike with soap water, and the other side with no water at all. Had problems with both. AND I even have a little experience with this job.
With the spray... you spray the area, remove the backing of the sticker, lay the sticker in place lightly, then measure and move until it's in the right spot, then start squeegeeing the water out from under the sticker starting in the middle and pushing the water out toward the edges. You do this with the paper on the front of the sticker so each letter stays in place. You have to be sure to push it into the low spots as you work toward the outer edge.
Plastic putty knife with rounded corners works for the squeegee. When you think your done, squeegee it all one last time pressing kinda hard to be sure it's stuck well. Then carefully peel the tape off of the front.
The decals are cut on a angle top and bottom. That top angled cut should line up with the VERY top of the frame seam...without the chrome strip in place.
>>>the soap water allows the decal to slide around until you press it tight to the frame..
I'm am NO pro. Maybe look up some youtube vids.