There are a few simple home-brew recipes like white vinegar or borax and lemon juice but these brews have added value in terms of chemistry, concentration and the addition of thickeners to make the cling to the treated item. Nothing to stop you using the traditional stuff while you wait for these to arrive in the post!

Nitromors Lightning Paint Stripper 1L, Powerful, Fast-Acting Paint Remover for Wood & Metal
5.0

Paint Predator Heavy Duty Paint and Varnish Stripper 500ml - High Performance Paint Remover - by Bartoline 1876 Professional Range
4.0