how to save payment instructions content without html tags

[DZotya]

I tried to save the payment instructions content without html tags.
But p html tags were added to content during saving into db.
It's problem to me because in case of bank transfer only the content of the first p tag of the payment instructions includes in the end of the email. The other parts will be removed during the render. Perhaps because of the md_indent.

How can I save it without html tags or what did I wrongly?