Since you are using Oxide, and mods - have you looked at installing the "Auto Purge" plugin? This is great for clearing of abandoned bases and whatnot.
I currently have it set up to automatically remove entities from players who have not connected to the server within 4 days. Depending on your server you can extend the length of time in between checks etc.
You will need to download the following plugins to make it work: Here are all the links.
Auto Purge: http://oxidemod.org/plugins/auto-purge.1566/
Basically, ConnectionDB records when a player has last connected, and Auto Purge checks against this in order to determine who gets purged.
Glad to hear you've made progress - how often is your wipe cycle?