@avernos did a Can about that. That should give you a good starting point.

Gerry Can Show You How To Strip Your Miniatures!

But no hot tub!

I’m based in the USA and have found the best liquid cleaner to be…………

LA’s Totally Awesome all Purpose Concentrated Cleaner.  I’ve used it to strip metal minis, plastic minis, and resin minis.  I’ve even used it to clean car upholstery, my mechanic’s hand tools and grease spots from jeans.

When stripping minis I use it in it’s concentrated form.  For other  cleaning projects I dilute it.

It can be found on Amazon.  But they want around $17 for a 32oz bottle.  I buy it at the Dollar store and pay $1 per 32oz bottle.  Unusual grab a 10 bottles for a whooping ten bucks plus tax.

99% Isopropyl alcohol is useful for getting rid of the “first layer” of paints, and it’s less caustic than stronger cleaners. (Do not use 70%, since it won’t work.) Then gloves and an old toothbrush. If any primer is left on the miniature, that’s usually fine. Then onto the stronger stuff, if you want.

There’s also USA Walmart’s Purple Power. But LA’s Totally Awesome is on my list.

Strip Paint off Miniatures Cheap and Easy – A How-To Guide

If you’re not in a hurry I’d had very good results with Detol. I generally leave the miniature in for around 24 hours and once it’s had a good go over with a toothbrush the metal looks shiny and new. Only downside is the smell as it can be very strong. Also don’t use water until all of the Detol infused paint is gone otherwise it’ll turn into a sticky mess (or so I’ve heard, never had that myself).

I’d imagine nail varnish remover would do a good job as well but I’ve never tried it was I’m happy with the Detol.

I recommend Biostrip

I’d second the Dettol suggestion. Works well, and reasonable quickly. Is readily available too.