Collectors of antique perfume bottles may find some that are desirable but which have turned cloudy. Denatured alcohol is sometimes effective in clearing the glass. Vinegar or a weak solution of muriatic acid in water is sometimes effective. Javelle water is a powerful bleach or some of the commercially made bleaches used in laundering clothes can be used to remove cloudy appearance from glass. After using any of these solutions, the bottle must be washed with soap and hot water and then rinsed thoroughly before it is used again for perfume.
An old fashioned cleaning method is to place a handful of birdshot with hot soapsuds in the bottle and shake gently. Torn up newspapers in hot soapsuds is effective for a wide mouthed bottle.
Other suggestions are to use toilet bowl cleaner to remove water scum and other dried on substances from glass bottles. I have also had some luck with nail polish remover (acetone) - shaken around and then the interior of the bottle rinsed out very well with soapy water.
If you have a cork stuck inside your perfume bottle. Tie a good knot in a piece of strong, put the knot end into the bottle, shake the cork into the neck of the bottle, pull the string and the cork will come out with it.