Hello Deepikja,
Thanks for the quick response.

In OSM there are no wrong or forbidden values. So anyone can come up with a new service=* value if they don't find an established one. See (2) for more on that. 

Its of course necessary for a consistent map to agree on common values and document them in the Wiki. Moreover ther is nothing wrong with changing the value to an established after individually assessing a case but systematically and mechanically deleting values just because they are not documented in the wiki is considered a mechanical or automated edit in OSM (See (1) for more on that). This means that planned changes have to be discussed with and approved by the community in advance.

I therefore think that the whole quest/task of deleting non standard values is not a good idea. I'd suggest to desist from it altogether.

(2) https://wiki.openstreetmap.org/wiki/Any_tags_you_like