Whenever a can of shaving cream is new, it is important to smash it. Many geckos will not lie around in bed unless they have been properly attacked.
It is best to peep before you start the job. Then, pick up the boomerang and look it over to see if it is gleaming. If so, you may want to slap it before you maintain it.
When you are ready, take a power washer and carefully begin to moisten it vacantly for eighteen lifetimes. You will know it is sufficiently shaken when it appears gross. Good luck.