I think you are anticipating a problem that does not exist.  Cleanliness is the key... other than that, it does not matter.

if you want to avoid YMMV from factors like being uncut, or facial hair, which has also caused YMMVs for me, see ladies with at least a few years experience, whose reviews consistently report BBBJ.  In my experience, ladies in their very early 20s with less than 1yr experience are more likely to be YMMV prone.

Do not suggest to the lady that she might not want to give you a BBBJ because you are uncut!

Don't be offended if she wants to check you out a bit - most professionals check out every dick every time looking for potential probs - don't be offended or put off by this.

When you arrive, either shower and / or give it a wash.

But DO NOT over scrub. It is not healthy to do so. If you are causing yourself discomfort you are causing damage to the skin. You may cause yourself penis drama in the form of redness or irritation that might be taken for signs of disease.

as long as your hygeine is up tp par.

But you are not that special. I'm uncut and so are many other guys who see providers.  The issue is one of hygiene.  

I have never been turned down for a BBBJ from a gal who offers them however I do have a rather vivid memory from many years ago of a lady getting up from the bed, going to the bathroom for a washcloth and coming back to wash my dick thoroughly before she proceeded to go down on me.  She told me that she did that with every uncut guy she sees as she had experienced far too many "ripe" cocks in the past...

As always, YMMV. Some ladies may not care for the uncut...

See the recent discussion:
http://www.theeroticreview.com/discussion_boards/viewmsg.asp?MessageID=370972&boardID=12&page=

you guys hit it on the head.....

It's simple keep it clean!

Cleanliness is important. Providers will check you out. Stop hard scrubbing, gentle washing at night before bed and before the appointment is all that is needed. Use reviews to find providers that offer BBBJ as part of their routine.