G-Code cleaning routine for a cold pull using nylon

Don't use the STL -- It's just there so Thingiverse is happy.
Tested with Marlin firmware, but no special codes are used.
Use Nylon filament; Taulman is best https://www.amazon.com/s/ref=as_li_ss_tl?url=search-alias=aps&field-keywords=taulman+nylon&linkCode=sl2&tag=poin0a-20&linkId=eb826af5361352a063300358c9bb8b94 -- I use 618.
Each line is documented

I was tired of the manual steps, so I coded up this routine:
Go to 230c, extrude 30 (to load filament -- Taulman Nylon 618)
Go t