I just bought the F.E.A.R bundle from steam a week ago or so, and beat the first game in the series 20 years after release. And other than a fan made .dll patch, it was great. Lacked some depth more modern titles have, but I also noticed how much effort was put into some details that were surprising for its age.
Drain cleaner can also be lye based, or a mix of potassium hydroxide and sodium hydroxide. Also, every container should have its actual ingredients on the bottle, I wouldn’t assume anything you intend on using off label.