Don't. Unless there are some really big specks of dirt inside the lens then they will have no effect at all on picture taking. To prevent the problem getting worse always store your lens with it's front and rear caps on and inside a lens bag. Also make sure that your camera bag is clean and isn't shedding fibres from the inner linings.
Dismantling your lens to clean it is really a job best left to a professional who will then additionally check and clean/lubricate the moving parts inside the lens.
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