Any product available in Poland to Strip Paint ?

You can get Dettol Liquid (best paint stripper ever) on Allegro.pl

Break fluid (at least DOT-3) does damage PP plastic if you keep models in for more than a couple of hours. Soaking them for 2-3 hours should be just fine. Still, PP plastic models tend not to be consistent when it comes to material quality, so I would advice caution in that regard.

I use and it works great, also as a cleaner for my brushes..

Alright ! So i went to carrefour and bought some cheap ass Polish nail remover (with acetone).

I let the stingers stir in a jar of it for a few hours and it worked wonderfully well for metal models. good !

it works within seconds and cheaper way to dom it is to but it in construction markets/shops, they have more % of acetone in it and come in big 700ml bottles. Or if you know someone from Chem School you can get 1 litre bottle of ninety something % acetone for free like I did