A way to delete older transactions from database?

We’re using WP Stripe to collect registration payments for an annual event. It’s the 2nd year using it, so now we need to delete the data from last year which is still there in the database. Is there a good way to do this?

I tried deactivating and deleting the plugin, and then re-installing it, but the old data is still there. So a feature request that would handle this is to have an option (or a default behavior?) to delete the data from the database upon deletion of the plugin. (This just seems like good practice anyway, right?)

Thanks,
-Paul

http://wordpress.org/plugins/wp-stripe/