Matt Zack wrote:

I am stripping an old set of oak stairs. Can anyone suggest a commercial
grade paint remover?

Use something relatively safe, like Peel-Away 6 or 7, for the initial
layer removal. Once you start hitting the wood, use methylene chloride
_AND FOLLOW ALL SAFETY INSTRUCTIONS_. Use brass-bristle brushes to get
the paint from the wood pores. Dental picks are good, too.

Avoid Citrustrip completely. Smells awful, barely strips, requires
oily-smelling chemical to clean it up.