DJ, Good ole soapy water and a toothbrush usually is the way to fly, however, once you start digging, some of your points may have calcified carbon ash attached to them from their alkaline buried environment. Some folks call it calechie also. A certain degree of this is good to have on points, as like patina, is a desireable characteristic when it comes to point authentication. I dig mostly in a large cave, and most of my points have these deposits, of which is very difficult to reproduce, and can be geo-chemically tested and verified. I still use water and a tooth brush to clean these, but I never vigorously scrub them, which can remove alot of the ash deposits.
Welcome aboard fossilfan, Oak Hill is a good area for numerous caves, Turitella fossil shells from the edwards limestone, and arrowhead hunting along creeks and streams.Lots of sites along upper Barton Creek West of town, if you can find a friendly land owner.
Look for flaked edges on those hunks of flint like uni-face and bi-face scraping tools.