How to clean out all the crumbs and dust out of a laptop keyboard?

Usually i just turn mine upside down and shake it. Or take a hair dryer and blow out the crumbs.

Turn it over or use an air duster. If you're planning to use a hair dryer make sure it is only set to blow, not heat. Laptop keys melt at surprisingly low temperatures.

Try a vacuum cleaner hose with a narrow attachment, or with a dust brush attachment. Some keyboards can be lifted to expose the area under the keys.

If these things don't work, take it to a repair shop. Also see about one of those clear keyboard covers that shield the whole thing. You'll probably have to get one from a dealer who sells your particular model - there are so many different keyboards.

You can get a can of compressed air at most places that sell computers and electronics.