...including hopefully cleaning their junk.

Most encounters for me happen after a long day at work and up to an hour sitting in L.A. traffic, so I'll usually request a shower on arrival.  At the very least I make it habit to bring a travel-sized toothbrush/toothpaste combo and a pocket back of flushable wipes.  I'll ask to use the bathroom then brush my teeth and do a quick wipe down of the "strategic" bits.

I find that ladies appreciate the effort and sessions tend to go better, especially the oral parts, when you make the effort to have fresh breath and a nice clean scent instead of smelling like gym shorts and whatever you had for lunch.

He put down the $$$$ and went to shower so she can count it and put the $$$$ in safe place  
Out of site out of mine.. and then the show starts ..

...I also bring a few flavored personal wipes with me. I get them in small packets that fit 2 or 3 in my back pocket. I offer the packet to her just before she starts any oral fun. And keep an extra I can use on her when needed - which is rare, but always better to be prepared.  

 
I find most providers appreciate this as a sign of respect and it reinforces my meticulous hygiene. Next, the flavors (cherry, mango, etc.) help keep the fun well... more fun.  

 
In addition, to ensuing our session will include specific acts that I want (it's all about mutual consent!), intimacy and enthusiasm are the two most-important qualities I look for in a great session.  Adding some small gestures that can make her more comfortable are always a good investment.  

 
Life is good

 
The Cat