I've used Ashbusters (833-0349). They seem to know the what they're doing and they do a decent job of clean up after. They also did a great job cleaning my 40-foot-long dryer vent!
Nan C. replied:
We have been using A-1 High Hat for 5 or 6 years and they have always been great. Small business owner, just Jim Rosinblum and his wife. They are certified, licsensed and insured... 615-333-0422.