Kim Kardashian found the oasis in the desert … scrubbing herself down in a cold bath to get clean while camping, in a moment her sister likened to the beginning of a pornographic movie!

On the newest episode of “The Kardashians” — released Thursday — Kim, Kris Jenner and Khloé Kardashian took a luxury RV out to Joshua Tree, California for an evening of glamping … a choice city girl Kim said had her feeling nasty.

After just one day at the campsite, Kim claimed she’d “never felt dirtier” and needed to shower … ’cause she simply refused to go to bed dusty.

Kim whipped out a loofah — something she says she always carries — and some soap to rub herself down. Watch the clip … she really goes to town on her bod, pouring soap over every inch of her body.

The scene prompted Khloé to say it looked like the “setup of a porn” … totally inappropriate for anyone to watch. Khloé also adds she was worried about getting murdered out in the desert — so, she was on high alert the entire time.

Khloé also mocks her sister’s showering in the episode … exaggerating the way Kim soaped herself up with a series of body rolls and other sexualized motions.