I luckily don't get many smelly clients. But I had one last week who said he'd already showered at home, but when he got naked his penis stank, so I pulled the foreskin back and almost puked with the amount of dick-cheese around his head. I wiped it away with baby wipes and did my best not to give him oral because I was still gagging on the taste. In 5 years, I've never had anyone smell/taste so bad in my life. It was as if he'd never pulled his foreskin back to clean himself properly before!