Paint Remover? and Wobbly Wheels

The Toby I was working on last year in a huge mess right now; I had tried to paint its funnel black multiple times, and the one time I got it, there was the slightest spot of black that wasn't meant to be tehre, and instead of wiping it up and ruining the whole thing, I waited for it to dry, and mixed some paint to match the color of the roof, and painted over it.
"Then, there was trouble..."
The roof-colored paint dried, and turned out to be a much shinier, darker color than I anticipated, and completely ruined the look of the model imo, and I tried scraping it off in panic, but it was too late. At an unknown time after that I also accidentally got a spot of greenish blue paint on one of his windows... That's also too dry to remove now, so I'm wondering if anyone could help with this situation...
I know I've mentioned this problem before, and my Dad suggested using turpentine, but both he and my mom decided against it after realizing it would probably melt the plastic, but we're unsure if this is the case. (What I'm saying is maybe one of you can confirm whether or not this is true?)

Another problem I've had with my Plarail Toby is that, ever since it came out of the box, its right driving wheel has been wobbling and swaying, sometimes causing Toby to look like he's skipping along the tracks instead of a smooth run.
There's probably a video that Ucwepn had made on this, but I never seem to be able to find them, so, how can I mend the wheel?

I mean, you could just paint over the poorly painted places on toby/ paint over it

I mean, you could just paint over the poorly painted places on toby/ paint over it

I'm a bit scared to try anymore... And I don't want to pester my mom to bring me back to Michael's to get a bunch of different gray and brown gloss enamels.

[Ucwepn]

thinners

It will depend on what type of paint has been used on it, enamels or acrylics for example. You could also try nail varnish remover, although that really pongs lol!

I used reducing Acahol over 50 on my trackmaster Neville and that is the best and or you could use something sharp and scrape it off

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,

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.

Just how hazardous are we talking about here? And what is PPE?

Personal Protective Equipment.

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.

Well not hazardous enough to kill you or permanently damage you, but hazardous enough to wear gloves and eye protection, gloves especially if you have sensitive skin! I'd hate for you to get dermatitis because of it!

This was the video I watched,

https://youtu.be/sQRhjvYbvB4
Basically submerge you item, leave it, remove and scraps. it's been working great for me,

And a video using dettol
https://youtu.be/BraWp0BKKmg