Physical = baby washcloth. Chemical is Differin++,
I live in Canada & buy Differin from iherb.ca. It would be a Rx cost for me.
If you use Differin, you might want to stock up, as I looked at my bottle and it’s made in Canada,
I suggest Differin - OTC in the US. I have using it since 2017. Lots of choices for serums.:)
2nd. This one is good. When I don't use Differin (Adapalene) I use this.