Bottles should be cleaned thoroughly before sanitizing. The first time you use a bottle it should be soaked in a cleaning solution (such as bleach water), and then scrubbed inside and out with our nylon bottle brush.
Ensure that there are no deposits in which bacteria or mold spores can hide by giving your bottles a deep cleaning. This will help the sanitizing solution get into all parts of the bottle; assuring sanitized bottles. If you rinse your bottles thoroughly, promptly and diligently after each use with your homebrew, only the sanitizing treatment will be necessary before each use in the future.
After the bottles have been cleaned with a brush, soak them in sanitizing solution or use the dishwasher with the heat cycle on to sanitize them. If you use bleach solution to sanitize, allow the bottles to drain upside down on a rack, or rinse them with boiled water.
Do not rinse them out with tap water unless it has been boiled first. Rinsing with unboiled tap water is a number one cause of spoiled batches.
Also sanitize the priming container, siphon unit, stirring spoon, and bottle caps. Do not boil or bake the bottle caps, as this may ruin the gaskets.
By maintaining clean equipment you will save yourself a lot of work and trouble.