It really works.

There were some spots of something, dried blood or hair dye or something, on a plastic surface and I tried water, detergent and exit mould and only got 30% of it off. Didn't want to scratch at it with anything so was using a chux. Then after a couple of days I remembered that vinegar and bi-carb are magical, and the carb soda would at least be a tiny bit abrasive but not in a damaging way, and the vinegar would at least be fizzy and fun, but it actually got the spots 99% off with just some steady rubbing. I'm just a tiny bit amazed.