I am not a big user of MIDI files from the internet, but in the past I have used the event editor to cleanup unwanted "stuff"

First I opened the file using <Open Special>, then using the Notation mode, I used the <Event Editor> (#)

All event types are shown, but the filter can be used to select the specific event type you are looking for.

Does this work for you?
BIAB for Windows Version 2019 (643)
Windows 10 (1909)