How to uninstall manually?

There was a 500 server error occurring both when accessing the scheduler both on the front end and in admin, so I used joomla to uninstall the component. I then re-installed with a new version (old version was more than a year old) and now events are not saved. When I add an event, a blank pop-up window appears. Also, in admin the event list shows the events from the old scheduler that I tried to remove.

Is there a way that I can manually uninstall this so that I can re-install it new?

Thanks

Hi,
You have to remove plugin as usual and after that remove several tables in database:
{prefix}_events_rec - it stores events
{prefix}_scheduler_options