This is a multiday job as it requires complete teardown of the interior first, even then it may require new carpets and underlay depending on what was spilled. e.g. dairy drink smell cannot be removed ever from nylon carpet.
There are some enzymatic cleaners that can take out sugary drink odours but make sure that the person offering such cleaning service knows such cleaners.
If they are going to rely on "khaara soda aur broosh" - move on to find better ones.
