I've been using Hibiclens (Chlorhexidine) lately after a couple of different medical procedures. Makes me wonder why Hibiclens is OK for skin use but not for u

I've been using Hibiclens (Chlorhexidine) lately after a couple of different medical procedures. Makes me wonder why Hibiclens is OK for skin use but not for use on inorganic surfaces like metal or plastic?