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samruddhi podesamruddhi pode 

How to bulk delete custom objects in production edition since we cannot fire any query or cannot use dataloader.io?

Also there is a restriction of using any app in org. What is the solution for this kind of scenario?
NagendraNagendra (Salesforce Developers) 
Hi Samruddhi,

If you are not fine with using dataloader.io and query then you may perform this operation successfully using workbench.

Extract all the record Ids from the custom object using WorkBench and keep them in .CSV file.

Now you can delete all those id's with the help of workbench.

URL for Workbench: Kindly mark this post as solved if the information help's so that it gets removed from the unanswered queue and becomes a proper solution which results in helping others who are really in need of it.

Best Regards,
Nagendra.P
SandhyaSandhya (Salesforce Developers) 
Hi,

You can use Enable Custom Object Truncate to delete all records.

http://www.greytrix.com/blogs/salesforce/2014/12/31/delete-all-records-from-a-custom-object/
 
http://www.simplysfdc.com/2015/07/salesforce-mass-delete-record-in-custom.html
 
https://developer.salesforce.com/forums/?id=906F0000000DEeKIAW
 
Hope this helps you!

Please mark it as Best Answer if my reply was helpful. It will make it available for other as the proper solution.
 
Thanks and Regards
Sandhya