Paint Remover? and Wobbly Wheels

I've got some old citadel figurines that I painted a number of years ago, I used enamel paints at the time and watching YouTube showed me how to remove the paint with brake fluid which I am currently doing, it is also safe for the plastics figurines. I know brake fluid can be quite hazardous so I wouldn't recommend it unless your confident and wearing the correct PPE. Not only this I don't know what effect it would have on trackmaster plastic,

When I was browsing YouTube there was also a 'dettol' method which is applied the same as brake fluid, but as before I don't know how it would effect the plastic,

Just how hazardous are we talking about here? And what is PPE?
And @Nigels, I'm using Americana Gloss Enamels now, but the paint I had used on my Plarail Toby are just normal acrylics. Today I just finished cleaning my room(s) so I can't go back to check what the brand was that I forgot, but many of the acrylics had a big, red apple in the logo.