Uninstalling process pending tasks

1. After I installed this module, the 'Blocks in Accordion' module worked fine with a few test blocks.

2. I created a few views (block with table view). I couldn't find this blocks when a tried to add these to an Accordion block. I flushed chache, ran cron: the issue didn't go away.

3. I tried to deinstall and reinstall the module. Deinstalling went ok but when I tried to reinstall I got the following message:

"Unable to install Blocks in Accordion, block_content.type.accordion_block, core.entity_form_display.block_content.accordion_block.default, core.entity_view_display.block_content.accordion_block.default, field.field.block_content.accordion_block.field_blocks, field.storage.block_content.field_blocks, migrate.migration.d7_accordion_blocks already exist in active configuration."

4. I flushed cache, ran cron, emptied temp files in default/files/js, removed the module and placed it back, searched the database tables for clues but couldnot find one, rebuild the site with /rebuild.php. The issue didn't go away.

Conclusion:
A chache is making life difficult.
- How to find a newly created views block?
- Maybe this module has to invoke extra cleaning on clear cache.

- Where to find and remove this cache as a workaround?
- Maybe this module has to do extra cleanup when deinstalled.