Yep, it's fine to scrub your crotch and bum with a gentlish shower gel or soap, but around your actual vulva, you should only use water or aqueous cream.
You can get some very gentle, natural bars of soap, or Vagisil, Canefresh and Soft & Gentle all do 'feminine' intimate washes that are meant to be gentler than standard shower gels. I also like the Sanex Zero products and you can get other products aimed at people with skin conditions.