Question: is there anyone out there that can illustrate how to remove ordinals
transactions from the mempool of my node?
Only for mempool? Use this patch and compile Bitcoin Core from source code,
https://gist.github.com/luke-jr/4c022839584020444915c84bdd825831. Otherwise you should run Bitcoin Core 0.12.1 or other client which doesn't support SegWit which means your node doesn't store any witness data.